Carl Sagan (21 December, 1981)
Publication of Limited Circulation 1
Isaac Asimov, Leonard Nimoy (Mar 2, 2011)
Internet Video 1
Nick Farrantello in The Humanist (2009/07)
Journal Article 2
Christopher L Bennett (Feb 12, 2018 10:23pm)
Message Posted to Online Forum/Discussion Group 1
Editor in Omni Magazine (10/01/1978)
Magazine Article 1
Hannu Rajaniemi in Macmillan (2014-07-15)
Book 4
H. G. Wells in Kessinger Publishing, LLC (2010-09-10)
Book 1
Poul Anderson in SF Today and Tomorrow (1974)
Book 1
Joe Haldeman in Macmillan (2009-02-17)
Book 3
Isaac Asimov in Science Fiction Book Club (2004)
Book 6
Larry Niven in Del Rey (2003-07-29)
Book 1
Stephen Baxter, Arthur C. Clarke in Macmillan (2001-01-15)
Book 1
