No authors listed.
Playboy 13(8): 31-35,108,112-118. August 1963.
Ketterer, David
Foundation 5:50-56. January 1974.
Patrouch, Joe
Lan's Lantern No. 41: 69-72. July 1993.
Pringle, David
in: Pringle, David. Science Fiction: The 100 Best Novels. New York: Carroll and Graf, 1985. pp.83-84.
Nicholls, Peter
in: Magill, Frank N., ed. Survey of Science Fiction Literature, Vol. 4. Englewood Cliffs, NJ: Salem Press, 1979. pp. 1821-1826.
Samuelson, David N.
Ph.D. Dissertation, University of Southern California, 1969. 433 p. (DAI-A 30(3): 1181. 1969.)
Peters, Ray
Zenith 6:2-4. September 1964.
Leading Edge No. 20/21: 58-62. Fall/Winter 1990.
Williams, Marie
Technology Review 111(6): [6 p.] November/December 2008.
Trombetta, Jim
New York Review of Science Fiction 24(1): 22-23. September 2011. (No. 277)
New York: Arno, 1975. 429 p. (Reprint of Doctoral Dissertation, 1969)
Stableford, Brian
in: Magill, Frank N., ed. Survey of Science Fiction Literature, Vol. 5. Englewood Cliffs, NJ: Salem Press, 1979. pp. 2474-2477.
Letson, Russell
Foundation 37:31-35. Autumn 1986.
Doherty, Nathaniel P.
Ph. D. Dissertation, State University of New York at Stony Brook, 2018. 217 p. (DAI-A 80(1)(E).)
McClenahan, C. L.
in: Budrys, Algis Benchmarks: Galaxy Bookshelf. Carbondale: Southern Illinois University Press, 1985. pp. ix-xvi.
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