Henry William Menard in Studies in Earth and Space Sciences: A Memoir in Honor of Harry Hammond Hess (1973)
Book 1
Isaac Asimov, Arthur C. Clarke in Prometheus Books (1997-12)
Book 1
James Lovelock in Science (8 May 1998)
Internet Article 5
Stephen Hawking in Transworld Digital (2009-11-10)
Book 3
Agnes Mary Clerke in Cambridge Univ Pr (2010-06-17)
Book 1
Roger Ebert in Chicago Tribune (March 30, 2011 7:21)
Blog 2
Jules Bergman in Langley Research Center (1985)
Book Chapter 3
Carl Sagan (1994)
Publication of Limited Circulation 4
John N. Warfield in World Scientific Publishing Company (2006)
Book 1
Thomas Wright in Cambridge University Press (2014-11-06)
Book 1
