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
Trimble, Bjo
Locus No. 91:9. July 22, 1971.
Bangsund, John
Canberra: Ronald E. Graham and John Bangsund, 1972. 100 p.
Malzberg, Barry N.
Analog 100(9): 75. September 1980.
in: Malzberg, Barry N. Engines of the Night. Garden City, NY: Doubleday, 1982. pp. 71-74.
McKitterick, Christopher
Argentus No. 11: 22-25. 2011.
Amazing 45(4): 91-103. November 1971. (Followed by a postscript by Ted White,)
Turner, George
SF Commentary No. 76: 34-37. October 2000. (Reprint)
Leane, Elizabeth
Science Fiction Studies 32(2): 225-239. July 2005.
Berger, Albert I.
Journal of Popular Culture 5(4):867-943. Spring 1972.
San Bernardino, CA: Borgo Press, 1993. 231pp.
Masters Thesis, Northern Illinois University, 1972. 151p.
Nevala-Lee, Alec; Wysocki, Edward M., Jr.
Analog 90(1/2): 44-50. January/February 2020.
Westfahl, Gary
Cooke, Brett, Slusser, George E., and Marti-Olivella, Jaume, eds. The Fantastic Other: An Interface of Perspectives. Amsterdam: Rodopi, 1998. pp. 187-208.
Trushell, John
Vector No. 224: 11-17. July/August 2002.
SFWA Bulletin 4(3):18-19. June 1968.
Gillings, Walter H.
Science Fiction Monthly 2(1): 8-11. 1974.
Nevala-Lee, Alec
Heinlein journal No. 2(1): 2-12. Fall 2019. (No. 25)
Ph.D. Dissertation, Claremont Graduate School, 1986. 395pp. (DAI-A 47(1): 184. July 1986.)
Lockwood, Stephen Paul
Ph. D. Dissertation, Indiana University, 1985. 417pp. (DAI-A 46(9), 2689. March 1986.)
Del Rey, Lester
in: Campbell, John W. John W. Campbell Anthology: Three Novels. Garden City, NY: Doubleday, 1973. pp. xi-xv.
Rocklynne, Ross
in: Greenberg, Martin H, ed. Astounding Science Fiction, July 1939. Carbondale: Southern Illinois University Press, 1981. p. 177-180.
O'Neill, P. D.
Starlog 100: 14. November 1985.
Grace, Dominick M.
in: Weiss, Allan, ed. The Canadian Fantastic in Focus: New Perspectivs. Jefferson, NC: McFarland, 2015. p. 55-66.
Green, Joe
SFWA Bulletin 40(2): 13-16. Fall 2006. (No. 171)
Arnold, Francis
Films and Filming 9(9):14-18. June 1963.
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