1999

Achenbach, Joel in his “Captured by Aliens” (1999) (available on Amazon USA and on Amazon UK) at pages 61 (in Chapter 5), 243 (in Chapter 24) of the Simon and Schuster hardback edition.

2

2001

Baxter, Stephen in his “Deep Future” (2001) (available on Amazon USA and on Amazon UK) at pages 154-155 (in Chapter 18) of the Gollancz paperback edition.

2

1970

Bergier, Jacques in his “Extraterrestrial Visitations From Prehistoric Times to the Present” (1970) at page 11 (in Chapter 1) of the Signet paperback edition, at page 12 of the Futura paperback edition (published under the title “Mysteries of the Earth”).

1

1999

Berry, Adrian in his “The Giant Leap” (1999) (available on Amazon USA and on Amazon UK) at pages 145-147 (in Chapter 11) of the revised Headline softcover edition.

3

2000

Clark, Stuart in his “Life on Other Worlds and How to Find It” (2000) (available on Amazon USA and on Amazon UK) at page 149 (in Chapter 11) of the Springer hardback edition.

1

1982

Crawford, Ian A in “Extraterrestrials: Where are they?” (1982) (edited by Michael Hart and Ben Zuckerman) (available on Amazon USA and on Amazon UK) at pages 62-66 (in Chapter 8) of the Cambridge softcover second edition. The relevant chapter is a revised and abridged version of an article published under the title “Interstellar Travel: A Review for Astronomers” in Quarterly Journal of the Royal Astronomical Society, Volume 31 (1990) at pages 377-400. The text of that article is available free online at: http://www.star.ucl.ac.uk/~iac/isflight/isflight.html

5

2003

Darling, David in his online encyclopedia, “The Encyclopedia of Astrobiology, Astronomy and Spaceflight” (2003) in the entry entitled “Interstellar ramjet”. The relevant entry is available online at:

http://www.daviddarling.info/encyclopedia/I/interstellar_ramjet.html

1

1991

Drake, Frank and Sobel, Dava in their “Is Anyone Out There?“ (1991) (available on Amazon USA and on Amazon UK) at pages 123-124 (in Chapter 6) of the Pocket Books paperback edition.

2

1982

Dyson, Freeman in “Extraterrestrials: Where are they?” (1982) (edited by Michael Hart and Ben Zuckerman) (available on Amazon USA and on Amazon UK) at page 46 (in Chapter 7) of the Cambridge softcover second edition.

1

1978

Edelson, Edward in his “Who Goes There?” (1978) (available on Amazon USA and on Amazon UK) at pages 92-94 (in Chapter 8) of the NEL paperback edition (with the same page numbering in the NEL paperback edition combining this book and Chris Boyce’s “Extraterrestrial Encounter).

3

1977

Gallant, Roy A in “Beyond Earth : The Search for Extraterrestrial Life” (1977) (available on Amazon USA and on Amazon UK) at page 168 (in Chapter 12) of the Four Winds hardback edition.

1

1980

Goldsmith, Donald and Tobias Owen in their “The Search for Life in the Universe” (1980) (available on Amazon USA and on Amazon UK) at pages 375-376 (in Chapter 19) of the Benjamin Cummings softcover edition, at page 444 (in Chapter 18) of the 1992 Addison Wesley softcover revised second edition.

2

1980

Greenwell, Richard J in “The Encyclopedia of UFOs” (1980) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 115 (forming part of an entry entitled “Extraterrestrial hypothesis”) of the NEL hardback edition.

1

1962

Kuiper, Thomas B H and Morris, Mark in “The Quest For Extraterrestrial Life : A Book of Readings” (1980) (edited by Donald Goldsmith) (available on Amazon USA and on Amazon UK) at page 202 (in Chapter 37) of the University Science Books hardback edition. The relevant chapter is a reprint of Sebastian von Hoerner “The General Limits of Space Travel”, Science, Volume 137 (1962.0700), pages 18ff.

1

1976

Landsburg, Alan in his “In Search of Extraterrestrials” (1976) (available on Amazon USA and on Amazon UK) at pages 111, 112 (in Chapter 9) of the Corgi paperback edition.

2

1974

Lunan, Duncan in his “Man and the Stars” (1974) (available on Amazon USA and on Amazon UK) at pages 30-33, 35 (in Chapter 2) of the Souvenir Press hardback edition, at pages 40-43, 45 of the Corgi paperback edition.

5

1989

Mallove, Eugene F and Matloff, Gregory L in their “The Starflight Handbook” (1989) (available on Amazon USA and on Amazon UK) at pages 14 (in Chapter 1), 107-121 (in Chapter 7 generally), 123-137 (in Chapter 8 generally), 158-159 (in Chapter 10) of the Wiley hardback edition.

33

1987

McDonough, Thomas R in his “The Search for Extraterrestrial Intelligence - Listening for Life in the Cosmos” (1987) (available on Amazon USA and on Amazon UK) at page 178 (in Chapter 13) of the Wiley softcover edition.

1

1974

Morrison, Philip in “Interstellar Communication : Scientific Perspectives” (1974) (edited by Cyril Ponnamperuma and A G W Cameron) (available on Amazon USA and on Amazon UK) at pages 171-172 (in Chapter 10) of the Houghton Mifflin softcover edition.

2

1988

Nicolson, Iain in his “The Road to the Stars” (1988) (available on Amazon USA and on Amazon UK) at pages 132-134 (in Chapter 7) of the Book Club Associates hardback edition.

3

1971

Oliver, Bernard and Billingham, John et al in “Project Cyclops: A Design Study of a System for Detecting Extraterrestrial Intelligent Life : NASA Contractor Report 114445 (“NASA CR 114445”)” (1971) (edited by Oliver, Bernard and Billingham, John) (available on Amazon USA and on Amazon UK) at page 34 (in Chapter 4) of the National Aeronautics and Space Administration softcover edition.

1

1998

Parker, Barry in his “Alien Life” (1998) (available on Amazon USA and on Amazon UK) at pages 207-208 (in Chapter 11) of the Plenum Trade hardback edition.

2

1981

Powers, Robert M in his “The Coattails of God: The Trip to the Stars” (1981) (available on Amazon USA and on Amazon UK) at pages 52-54 (in Chapter 3) of the Warner paperback edition.

3

1978

Ridpath, Ian in his “Messages from the Stars” (1978) (available on Amazon USA and on Amazon UK) at pages 106-107 (in Chapter 6) of the Fontana paperback edition.

2

1975

Ridpath, Ian in his “Worlds Beyond” (1975) (available on Amazon USA and on Amazon UK) at pages 147-148 (in Chapter 8) of the Wildwood House softcover edition, at pages 154-155 of the revised 1977 Penguin softcover edition entitled “Signs of Life”.

2

1973

Roulet, Alfred in his “The Search for Intelligent Life in Outer Space” (1973) (available on Amazon USA and on Amazon UK) at page 59 (in the unnumbered chapter entitled “Hello, Out There”) of the Berkley paperback edition.

1

1980

Sagan, Carl in “The Quest For Extraterrestrial Life : A Book of Readings” (1980) (edited by Donald Goldsmith) (available on Amazon USA and on Amazon UK) at pages 209-210 (in Chapter 38) of the University Science Books hardback edition. The relevant chapter is a reprint of “Direct Contact Among Galactic Civilizations by Relativistic Interstellar Spaceflight” Planetary and Space Science Volume 11 (1963), issue 11, pages 485-498.

2

1980

Sagan, Carl in his “Cosmos“ (1980) (available on Amazon USA and on Amazon UK) at pages 232-233 (in Chapter 8) of the Abacus softcover edition.

2

1966

Shklovskii, Iosef Shmuelovich and Sagan, Carl in their “Intelligent Life in the Universe” (1966) (available on Amazon USA and on Amazon UK) at pages 445-447 (in Chapter 32) of the Picador softcover edition.

3

1998

Shostak, Seth in his “Sharing the Universe” (1998) (available on Amazon USA and on Amazon UK) at page 139 (in Chapter 7) of the Berkeley Hills softcover edition.

1

1976

Stoneley, Jack and Lawton, A in their “CETI: Communication with Extra-Terrestrial Intelligence” (1976) (available on Amazon USA and on Amazon UK) at page 100 (in Chapter 11) of the Star Books paperback edition.

1

1974

Stoneley, Jack and Lawton, A in their “Is Anyone Out There?” (1974) (available on Amazon USA and on Amazon UK) at pages 175-181 (in Chapter 10) of the Star Books paperback edition.

7

1964

Sullivan, Walter in his “We Are Not Alone” (1964) (available on Amazon USA and on Amazon UK) at pages 236-237 (in Chapter 16) of the Signet paperback revised editions.

2

1962

von Hoerner, Sebastian in “Interstellar Communication : A Collection of Reprints and Original Contributions” (1963) (edited by A G W Cameron) (available on Amazon USA and on Amazon UK) at pages 155, 159 (in Chapter 14) of the W A Benjamin hardback edition. The relevant chapter is a reprint of Sebastian von Hoerner “The General Limits of Space Travel”, Science, Volume 137 (1962.0700), pages 18ff.

2

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 65 (in Chapter 4), 253 (in the Notes and Further Reading) of the Copernicus hardback edition.

2

1998

White, Michael in his “Life Out There” (1998) (available on Amazon USA and on Amazon UK) at pages 148-149 (in Chapter 8) of the Little, Brown & Co hardback edition.

2

1977

Wolfe, John in “The Search for Extraterrestrial Intelligence : NASA Special Publication 419 (“NASA SP 419”)” (1977) (edited by Morrison, Philip and Billingham, John and Wolfe, John) at page 72 (in Section 3, in Complementary Document 1) of the National Aeronautics and Space Administration softcover edition. Text of relevant report available free online at: http://history.nasa.gov/SP-419/contents.htm

1

1999

Zubrin, Robert in his “Entering Space: Creating a Spacefaring Civilization” (1999) (available on Amazon USA and on Amazon UK) at pages 204-207 (in Chapter 9) of the Tarcher Putnam hardback edition.

4