Pohl, Frederik
Locus No. 90:8. July 12, 1971.
Schmitz, J. H.
Locus No. 90:7-8. July 12, 1971.
Simak, C. D.
Locus No. 90:9. July 12, 1971.
Van Vogt, A. E.
Moskowitz, Sam
in: Moskowitz, Sam. Seekers of Tomorrow. New York: Ballantine, 1967. pp. 35-53.
Silverberg, Robert
Locus No. 90:6. July 12, 1971.
Sturgeon, Theodore
Locus No. 91:8. July 22, 1971.
No authors listed.
in: Contemporary Literary Criticism. Detroit: Gale, 1985. Vol. 32. pp.71-82.
Fantasy Times No. 104:4,9. April (2) 1950.
Locus No. 96:1. September 24, 1971.
New York Times p. 36. July 13, 1971.
Solstein, Eric
New York: Digital Media Zone, 2002. 1 DVD.
Schweitzer, Darrell
in: Schweitzer, Darrell. The Threshold of Forever: Essays and Reviews. s.l.: Wildside Press, 2017. p. 87-98. Reprinted from Weird Fiction Review, No. 3, Fall 2012.
Locus No. 90:1. July 12, 1971.
Dickson, Gordon R.
SFWA Bulletin 7(2):1-3. 1971.
Conley, G. W.
in: Cowart, David, ed. Twentieth-Century American Science Fiction Writers, Part 1: A-L Detroit: Gale, 1981. pp. 97-101. (Dictionary of Literary Biography, v. 8)
Bleiler, Everett F.
in: Bleiler, E. F., ed. Science Fiction Writers. New York: Scribners, 1982. pp. 151-159.
Sandercombe, W. Fraser
in: Sandercombe, W. Fraser. Masters of SF: The Science Fiction Hal of Fame. Ontario: Collector's Guide Publishing, 2010. p. 5-10.
Bova, Ben
Analog 135(6): 51-55. June 2015.
Bleiler, E. F.
In: Bleiler, Richard, ed. Science Fiction Writers. Second Edition. New York: Scribner’s, 1999. p. 159-168.
Fantasy Times No. 87:3. August (1) 1949.
Science Fiction Times No. 274:1-2. July (1) 1957.
Wysocki, Edward M., Jr.
Science Fiction Studies 38(3): 558-562. November 2011.
Klass, Philip
Pennsylvania English 10(2): 15-19. Spring 1984.
de Camp, L. Sprague
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