1999

Achenbach, Joel in his “Captured by Aliens” (1999) (available on Amazon USA and on Amazon UK) at page 105, 106 (in Chapter 9) of the Simon and Schuster hardback edition.

2

1995

Ashpole, Edward in his “The UFO Phenomena” (1995) (available on Amazon USA and on Amazon UK) at page 71 (in Chapter 5), 139-150 (Chapter 11 generally) of the Headline hardback edition.

1

1997

Ashpole, Edward in his “Where is Everybody?” (1997) (available on Amazon USA and on Amazon UK) at pages 149, 159-163 (in Chapter 10) of the Sigma Press softcover edition.

6

1987

Baird, John C in his “The Inner Limits of Outer Space” (1987) (available on Amazon USA and on Amazon UK) at page 28 (in Chapter 3) of the Dartmouth hardback edition.

1

2001

Baxter, Stephen in his “Deep Future” (2001) (available on Amazon USA and on Amazon UK) at pages 166-171 (in Chapter 20 generally), 176-177 (in Chapter 21), 185 (in Chapter 22) of the Gollancz paperback edition.

9

1990

Billings, Linda in “First Contact” (1990) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 229 (in Chapter 7) of the NAL Books hardback edition, at page 288-289 of the Headline paperback edition.

1

1990

Bracewell, Ronald N in an interview in David W Swift’s “SETI Pioneers : Scientists Talk About Their Search for Extraterrestrial Intelligence” (1990) (available on Amazon USA and on Amazon UK) at page 150 (in the unnumbered chapter entitled “Ronald N Bracewell”) of the Arizona hardback edition.

1

1999

Brin, David in “Are We Alone in the Cosmos” (1999) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 142 (in Chapter 3, essay entitled “Mystery of the Great Silence”) of the ibooks softcover edition.

1

1990

Brin, David in “First Contact” (1990) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 123 (in Chapter 3, essay entitled “Mystery of the Great Silence”) of the NAL Books hardback edition, at page 160 of the Headline paperback edition.

1

1997

Brin, David in “Making Contact” (1997) (edited by Bill Fawcett) (available on Amazon USA and on Amazon UK) at pages 231 (in Section 3), 269-270, 280, 284 (in Section 4) of the Morrow hardback edition.

5

1999

Clarke, Arthur C in “Are We Alone in the Cosmos” (1999) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 290 (in Chapter 7) of the ibooks softcover edition.

1

1987

Clarke, Arthur C in “Arthur C Clarke’s Chronicles of the Strange and Mysterious” (1987) (by Fairley, John & Welfare, Simon) at page 177 (in Chapter 9) of the Guild Publishing hardback edition.

1

1990

Clarke, Arthur C in “First Contact” (1990) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 308 (in Chapter 10) of the NAL Books hardback edition, at page 392 of the Headline paperback edition.

1

1993

Clarke, Arthur C in his “By Space Possessed” (1993) (available on Amazon USA and on Amazon UK) at page 123-124 (in Chapter 12) of the Victor Gollancz hardback edition.

2

2000

Darling, David in his “The Extraterrestrial Encyclopedia” (2000) (available on Amazon USA and on Amazon UK) at page 153 (in the entry entitled “Fermi Paradox”) of the Three Rivers softcover edition.

1

2000

Darling, David in his “The Extraterrestrial Encyclopedia” (2000) (available on Amazon USA and on Amazon UK) at pages 424 (in the entry entitled “Tipler’s Argument”), 365 (in the entry entitled “Sagan’s Response”), 448-449 (in the entry entitled “von Neumann probes”) of the Three Rivers softcover edition.

4

2003

Darling, David in his online encyclopedia, “The Encyclopedia of Astrobiology, Astronomy and Spaceflight” (2003) in the entry entitled “Tipler, Frank J.”. The relevant entry is available online at: http://www.daviddarling.info/encyclopedia/T/Tipler.html

1

2003

Darling, David in his online encyclopedia, “The Encyclopedia of Astrobiology, Astronomy and Spaceflight” (2003) in the entry entitled “Tipler’s Argument”. The relevant entry is available online at: http://www.daviddarling.info/encyclopedia/T/Tiplersargument.html

1

1999

Davidson, Keay in his “Carl Sagan: A Life” (1999) (available on Amazon USA and on Amazon UK) at pages 347 (in Chapter 14), 483 (in the Notes) of the Wiley softcover edition.

2

1995

Davies, Paul in his “Are we Alone?“ (1995) (available on Amazon USA and on Amazon UK) at pages 45-48 (in Chapter 4) of the Penguin paperback edition.

4

1998

Dick, Steven J in his “Life on Other Worlds“ (1998) (available on Amazon USA and on Amazon UK) at pages 219-220 (in Chapter 7) of the Cambridge hardback edition.

2

1996

Dick, Steven J in his “The Biological Universe” (1996) (available on Amazon USA and on Amazon UK) at pages 445-448 (in Chapter 8) of the Cambridge hardback edition.

4

1991

Drake, Frank and Sobel, Dava in their “Is Anyone Out There?“ (1991) (available on Amazon USA and on Amazon UK) at pages 204-207 (in Chapter 9) of the Pocket Books paperback edition.

4

1997

Emmons, Charles F in his “At The Threshold: UFOs, Science and the New Age” (available on Amazon USA and on Amazon UK) at pages 43-44 (in Chapter 4) of the Wild Flower Press softcover edition.

2

1990

Guthke, Karl S in his “The Last Frontier : Imagining Other Worlds From the Copernican Revolution to Modern Science Fiction: Imagining Other Worlds From the Copernican Revolution to Modern Science Fiction” (1990) (available on Amazon USA and on Amazon UK) at page 14 (in Chapter 1.1) of the Cornell University softcover edition.

1

1997

Halpern, Paul in his “The Quest For Alien Planets” (1997) (available on Amazon USA and on Amazon UK) at pages 3-5 (in the Introduction), 251-258 (in Chapter 8) of the Plenum Trade hardback edition.

11

1997

Harrison, Albert A in his “After Contact: The Human Response to Extraterrestrial Life” (1997) (available on Amazon USA and on Amazon UK) at pages 39 (in Chapter 2), 188-192 (in Chapter 7), 304 (in Chapter 12) of the Plenum Trade hardback edition.

7

1999

Hennessey, Roger in his “Worlds Without End : The Historic Search for Extraterrestrial Life” (1999) (available on Amazon USA and on Amazon UK) at page 128 (in Chapter 12) of the Tempus hardback edition.

1

1982

Jones, Eric M in “Extraterrestrials: Where are they?” (1982) (edited by Michael Hart and Ben Zuckerman) (available on Amazon USA and on Amazon UK) at pages 92-102 (in Chapter 11 generally) of the Cambridge softcover second edition.

11

1997

Kanon, Gregory M in his “The Great UFO Hoax” (1997) (available on Amazon USA and on Amazon UK) at page 2 (in Chapter 1) of the Galde Press softcover edition.

1

2000

Koerner, David & LeVay, Simon in their “Here Be Dragons” (2000) (available on Amazon USA and on Amazon UK) at page 178 (in Chapter 7) of the Oxford softcover edition.

1

2001

Lamb, David in his “The Search for Extraterrestrial Intelligence : A Philosophical Inquiry” (2001) (available on Amazon USA and on Amazon UK) at pages 160-163, 164, 165 (in Chapter 6), 195-196 (in Chapter 8) of the Routledge softcover edition.

8

2000

Leslie, John in “Many Worlds” (2000) (edited by Stephen J Dick) (available on Amazon USA and on Amazon UK) at pages 120-121 (in Part 2, in the unnumbered chapter entitled “Intelligent Life in the Universe”) of the Templeton Foundation softcover edition.

2

1987

McDonough, Thomas in his “The Search for Extraterrestrial Intelligence - Listening for Life in the Cosmos” (1987) (available on Amazon USA and on Amazon UK) at pages 192-193, 198-202 (in Chapter 15) of the Wiley softcover edition.

1999

McDonough, Thomas R in “Are We Alone in the Cosmos” (1999) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at page 86 (in Chapter 2) of the ibooks softcover edition.

1

1990

McDonough, Thomas R in “First Contact” (1990) (edited by Ben Bova and Byron Preiss) (available on Amazon USA and on Amazon UK) at pages 67-68 (in Chapter 2) of the NAL Books hardback edition, at pages 87-88 of the Headline paperback edition.

2

1998

Parker, Barry in his “Alien Life” (1998) (available on Amazon USA and on Amazon UK) at pages 187-188, 190, 194-195 (in Chapter 11) of the Plenum Trade hardback edition.

5

1999

Poundstone, William in his “Carl Sagan: A Life in the Cosmos” (1999) (available on Amazon USA and on Amazon UK) at pages 271-274, 276-278 (in the chapter entitled “Los Angeles 1978-81”) of the Owl Books softcover edition.

7

1985

Regis, Edward in “Extraterrestrials: Science and alien intelligence” (1985) (edited by Edward Regis) (available on Amazon USA and on Amazon UK) at pages 130-131 (in the introduction to Part 4) of the Cambridge University Press softcover edition.

2

1983

Ridpath, Ian in his “Life Off Earth” (1983) (available on Amazon USA and on Amazon UK) at pages 95-96 (in Chapter 8), 114 (in Chapter 9) of the Granada hardback edition.

3

1983

Sagan, Carl and Newman , William in “Extraterrestrials: Science and alien intelligence” (1985) (edited by Edward Regis) (available on Amazon USA and on Amazon UK) at pages 151-161 (in Part 4) of the Cambridge University Press softcover edition, particularly at page 153. The relevant chapter is a reprint of the article “The solipsist approach to extraterrestrial intelligence”, Quarterly Journal of the Royal Astronomical Society, Volume 24 (1983), pages 113-121.

Sagan’s discussion is in turn discussed in by:

Jones, Eric M in “Extraterrestrials: Where are they?” (1982) (edited by Michael Hart and Ben Zuckerman) (available on Amazon USA and on Amazon UK) at page 93 (in Chapter 11) of the Cambridge softcover second edition.

Lamb, David in his “The Search for Extraterrestrial Intelligence : A Philosophical Inquiry” (2001) (available on Amazon USA and on Amazon UK) at pages 162-163 (in Chapter 6) of the Routledge softcover edition.

Webb, Stephen in his “Where is Everybody?: Fifty Solutions to the Fermi Paradox” (2002) (available on Amazon USA and on Amazon UK) at pages 73-74 (in Chapter 4) of the Copernicus hardback edition.

Poundstone, William in his “Carl Sagan: A Life in the Cosmos” (1999) (available on Amazon USA and on Amazon UK) at pages 276-278 (in the chapter entitled “Los Angeles 1978-81”) of the Owl Books softcover edition.

Darling, David in his online encyclopedia, “The Encyclopedia of Astrobiology, Astronomy and Spaceflight” (2003) in the entry entitled “Sagan’s Response”. The relevant entry is available online at: http://www.daviddarling.info/encyclopedia/S/SagansResponse.html

11

2001

Sheaffer, Robert in “The Encyclopedia of Extraterrestrial Encounters” (2001) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 532 (in an entry entitled “Search for Extraterrestrial Intelligence, The (SETI)”) of the New American Library softcover edition, at pages 520-521 of the pdf edition (with the same page numbering in the Microsoft Word edition).

1

2001

Sheaffer, Robert in “The Mammoth Encyclopedia of Extraterrestrial Encounters” (2001) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 639 (in an entry entitled “Search for Extraterrestrial Intelligence, The (SETI)”) of the Robinson softcover edition.

1

1998

Shostak, Seth in his “Sharing the Universe” (1998) (available on Amazon USA and on Amazon UK) at page 127 (in Chapter 6) of the Berkeley Hills softcover edition.

1

1998

Swords, Michael D in Jerome Clark’s “The UFO Encyclopedia: The Phenomenon from the Beginning - 2^nd edition” (1998) (available on Amazon USA and on Amazon UK) in Volume 1:A-K at page 370 (in an entry entitled “Extraterrestrial Hypthothesis and Science”) of the Omnigraphics hardback edition.

1

1998

Swords, Michael in Jerome Clark’s “The UFO Book: Encyclopedia of the Extraterrestrial” (1998) (available on Amazon USA and on Amazon UK) at pages 193-194 of the Visible Ink Press softcover edition in an entry entitled “Extraterrestrial Hypothesis and Science”.

2

1996

Swords, Michael in Jerome Clark’s “The UFO Encyclopedia: 1st edition: Volume 3 – High Strangeness” (1996) (available on Amazon USA and on Amazon UK) at page 183 of the Omnigraphics hardback edition in an entry entitled “Extraterrestrial Hypothesis and Science”.

1

1990

Tarter, Jill Cornell in an interview in David W Swift’s “SETI Pioneers : Scientists Talk About Their Search for Extraterrestrial Intelligence” (1990) (available on Amazon USA and on Amazon UK) at page 357 (in the unnumbered chapter entitled “Jill Cornell Tarter”) of the Arizona hardback edition.

1

2002

Webb, Stephen in his “Where is Everybody?: Fifty Solutions to the Fermi Paradox” (2002) (available on Amazon USA and on Amazon UK) at pages 23-24 (in Chapter 2), 72-84 (in Chapter 4), 254-255 (in the Notes and Further Reading) of the Copernicus hardback edition.

17

1990

White, Frank in his “The SETI Factor” (1990) (available on Amazon USA and on Amazon UK) at pages 29-30 (in Chapter 3) of the Walker hardback edition.

2

1998

White, Michael in his “Life Out There” (1998) (available on Amazon USA and on Amazon UK) at pages 156-158 (in Chapter 8), 185-188 (in Chapter 10) of the Little, Brown & Co hardback edition.

7

1997

Wilkinson, David in his “Alone in the Universe?” (1997) (available on Amazon USA and on Amazon UK) at pages 77-79 (in Chapter 5) of the Monarch softcover edition.

3