Clarke, Arthur C.
Fantasy Advertiser 4(__): 10-14. 1950. [Not seen.]
Fantasy Advertiser 5(1): 15-19. April 1951.
Holloway, Samantha
in: Telotte, J. P., ed. The Essential Science Fiction Television Reader. Lexington : University Press of Kentucky, 2008. p. 177-191.
Smith, L. S.
Riverside: University of California, Riverside Library, 1979. 45 p.
Dick, Steven J.
in: Geppert, Alexander C. T., ed. Imagining Outer Space: European Astroculture in the Twentieth Century. Houndmills, Basingstoke, UK: Palgrave Macmillan, 2012. p. 27-44.
Anderson, Poul
in: Ash, Brian, ed. Visual Encyclopedia of Science Fiction. New York: Harmony, 1977. pp. 68-77.
Campbell, Mary B.
The Yearbook of English Studies 41(1): 190-204. 2011.
Nadis, Fred
New York: Pegasus Books, 2020. 352 p.
Rosa, Jorge M.
Extrapolation 54(1): 47-72 Spring 2013.
Benford, Gregory; Benford, James
s.l..: Microwave Sciences, 2013. 328 p.
Baxter, Stephen; Crawford, Ian
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 225-238.
Ceowl, Adam
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 169-192.
Schwartz, Peter
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 27-40.
Westfahl, Gary
Science Fiction Studies. 24(2): 193-206. July 1997.
Silverberg, Robert
in: Silverberg, Robert. Musings and Meditations: Reflection on Science Fiction and Other Matters. New York: Nonstop, 2011. p. 130-133. (Reprinted from Asimov's Science Fiction, June 2003)
Hillegas, Mark R.
Ph.D. Dissertation, Columbia University, 1957. 258pp.
Benjamin, Marina
New Statesman 132(4624): 32-33. February 10, 2003.
Giles, Geoffrey
Fantasy Review 3(16): 16-19. Autumn 1949.
Johnson, Les; Matloff, Gregory L.
Analog 126(11): 44-53. November 2006.
Landis, Geoffrey
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 119-128.
Lucas, Paul
Strange Horizons [8 p.] January 12, 2004. (Online resource: http://www.strangehorizons.com/)
Strange Horizons [10 p.] January 19, 2004. (Online resource: http://www.strangehorizons.com/)
Kanas, Nick
Analog 129(10): 33-41. October 2009.
Mallove, Eugene; Matloff, Gregory L.
New York: Wiley, 1989. 274 p.
Silk, Molly
SFRA Review 50.2: Spring/Summer 2020. 157-167.
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