Laughlin, Charlotte; Levack, Daniel J. H.
Columbia, PA: Underwood/Miller, 1983. 328 p.
de Camp, L. Sprague
Foundation 4:25-27. July 1973.
In: De Camp, L. Sprague and Scithers, George, eds. The Conan Swordbook. Baltimore: Mirage Press, 1969. p. 81-91. 
Also in: De Camp, L. S., ed. Blade of Conan. New York: Ace, 1979. pp. 113-121.
No authors listed.
Locus 21(5):5, 72-73. May 1988.
Hockert, Valeria
Writer's Journal 12(4):11-14. May/June 1991.
Geis, R. E.; Schweitzer, Darrell
Science Fiction Review 4(4):11-14. 1975.
R. E. H.: Lone Star Fictioneer. 4(1): 37-39. Apring 1976.
Fantasy Times No. 195:3. February (1) 1954.
Moskowitz, Sam
in: Moskowitz, Sam. Seekers of Tomorrow. New York: Ballantine, 1967. pp. 155-169.
Stableford, Brian M.
in: Bleiler, E. F., ed. Science Fiction Writers. New York: Scribners, 1982. pp. 179-184.
Robins, W. M.
in: Cowart, David, ed. Twentieth-Century American Science Fiction Writers, Part 1: A-L. Detroit: Gale, 1981. pp. 112-119. (Dictionary of Literary Biography, v. 8)
Schweitzer, Darrell
in: Schweitzer, Darrell, ed. Science Fiction Voices #1. San Bernardino, CA.: Borgo Press, 1979. pp. 53-63. (An earlier version appeared in Squonk, Summer 1979.)
In: Bleiler, Richard, ed. Science Fiction Writers. Second Edition. New York: Scribner’s, 1999. p. 229-235.
Barrett, David V.
Guardian (UK) [2 p.] November 18, 2000. (Cited from the online version)
File 770 No. 137: 11. January 2001.
Science Fiction Chronicle No. 208: 53. October/November 2000.
Barrett, Stephen
Skeptical Inquirer 25(2): 6-7. April 2001.
in: Bleiler, E. F., ed. Supernatural Fiction Writers. New York: Scribner's, 1985. pp.925-932.
Bloom, Harold
in: Bloom, Harold, ed. Modern Fantasy Writers. New York: Chelsea House, 1995. pp.29-42.
Analog 121(4): 9. April 2001.
Pohl, Frederik
in: Pohl, Frederik, ed. The SFWA Grand Masters. Vol. 1. New York: Tor, 1999. p. 265-268.
Thiel, John
Lan's Lantern 24:16-17. November 1987.
Williamson, Jack
Locus 45(6): 69. December 2000.
Turtledove, Harry
Locus 45(6): 69-70. December 2000.
Drake, David
Locus 45(6): 70. December 2000.
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