Ellison, Harlan; Harness, Charles L.
in: Sargent, Pamela, ed. Nebula Awards 31. New York: Harcourt, 1997. pp.221-230.
Van Vogt, A. E.
in: Resnick, Mike and Siclari, Joe, eds. Worldcon Guest of Honor Speeches. Deerfield, IL: ISFIC Press, 2006. p. 26-38.
Elliot, J. M.
Science Fiction Review 6(4):19-23. November 1977.
Thiessen, J. G.
Science Fiction Collector 8:4-7. October 1979.
Mallett, Daryl F.; Slusser, George E.
SFRA Review No. 210: 51-54. March/April 1994.
Questar 2(3):22-26,58. June 1980.
No authors listed.
Science Fiction Chronicle 4(11):26. August 1983.
Goimard, Jacques
In: Goimard, Jacques. Univers sans limites. [Tome 1], Critique de la science-fiction. Paris: Pocket, 2002. p. 165-170.
Chabot, Hugues
Cycnos 22(1): [17 p.]. Octobre 2005. . (La science-fiction dans l’histoire, l’histoire dans la science-fiction)URL : http://epi-revel.univ-cotedazur.fr/publication/item/645(URL:�http://revel.unice.fr/cycnos/document.html?id=544)
Elliot, Jeffrey M.
Amazing Stories 28(5):6-14. March 1982.
Trushell, John
Vector No. 224: 11-17. July/August 2002.
Royberghs, Thomas
Master's Thesis, Universite Libre de Bruxelles, 2017. 99 p.
Nowinski, Larry
Lan's Lantern No. 37: 28-33. May 1991.
Gillings, Walter H.
Science Fiction Monthly 2(2): 16-17. 1975.
Cox, A. J.
Fantasy Times No. 77:1-2. March 1, 1949.
in: Greenberg, Martin H., ed. Fantastic Lives.. Carbondale: Southern Illinois University Press, 1981. pp. 175-215.
Science Fiction Chronicle 17(4): 6. May 1996.
Zebrowski, George
Science Fiction Age 3(6): 30-36, 100. 1995.
Willems, Brian
Science Fiction Studies 45(1): 146-160. March 2018.
Drake, Harold L.
Polk City, IA: Drumm, 1989. 30pp.
Walters, Trent
The Zone [4 p.] (Cited from: The Zone. Http://www.zone-sf.com/)
in: Greenberg, Martin H, ed. Astounding Science Fiction, July 1939. Carbondale: Southern Illinois University Press, 1981. p. 167-172.
Houston, David
Starlog 100: 16. November 1985.
Chicago Tribune. February 2, 2000. 1p. (Cited from the on-line edition.)
Playboy 13(7): 25-37. July 1963.
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