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
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Ceowl, Adam
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Schwartz, Peter
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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/)
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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.
Everett, Allen; Roman, Thomas
Chicago; University of Chicago Press, 2012. 268 p.
Rees, Martin
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Fewer, Greg
in: Russell, Miles, ed. Digging Holes in Popular Culture: Archaeology and Science Fiction Oxford, UK: Oxbow Books, 2002. p. 112-120.
Yandell, Stephen
Mythlore 12(1):9-23. Autumn 1985.
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