Barrett, Robert R.
Burroughs Bulletin No. 42: 25-29. Spring 2000.
Waters, William P.
Springfield, IL: Waters, 1990. 68pp.
Weinberg, Robert
in: Tymn, M. B. and Ashley, Mike. Science Fiction, Fantasy, and Weird Fiction Magazines. Westport, CT: Greenwood, 1985. pp. 365-366.
Adams, David A.
Burroughs Bulletin NS. No. 23: 13-17. July 1995.
Counts, Kyle
Starlog 263: 48-51. June 1999.
Van Hise, James
Burroughs Bulletin NS. No. 23: 3-12. July 1995. Also in: Van Hise, James, ed. Edgar Rice Burroughs' Fantastic Worlds. Yucca Valley, CA: James Van Hise, 1996. pp.37-42.
Thomas, G. W.
Dark Worlds Quarterly p. 60-63. Spring 2018.
Warren, Bill
Starlog 217: 35-39, 66. August 1995.
Westfahl, Gary
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 446-448.
No authors listed.
Science Fiction Chronicle 7(5):8. February 1986.
Fung, Yuk-ling
Master's Thesis, University of Hong Kong, 2003. vi, 164 p. https://hub.hku.hk/handle/10722/56149
Howey, Allyn
Strange Horizons [13 p.] March 3, 2008. (http://strangehorizons.com/)
Pringle, David
in: Pringle, David. Science Fiction: The 100 Best Novels. New York: Carroll and Graf, 1985. pp.197-198.
Tatsumi, Takayuki
Paradoxa 2(1): 61-72. 1996.
Variety pp.3, 40. October 24, 1979.
Taylor, Henry M.
Cineaction No. 86: 4-13,2. 2012.
Hanna, Monica; Saldivar, Jose D.; Vargas, Jennifer H.
Duke University Press, 2016. 437 p.
Lord, Glenn
in: Szumskyj, Benjamin, ed. Two-Gun Bob: A Centennial Study of Robert E. Howard. New York: Hippocampus, 2006. p. 22-24. (Reprinted in French translation, in: in: Tortey, Fabrice, ed. Echos de Cimmérie: hommage à Robert Ervin Howard (1906-1936). Paris: Oeil du sphinx, 2009. p. 99-102.
Franzen, Niklas
in: Georgi, Sonja and Loock, Kathleen, eds. Of Body Snatchers and Cyberpunks: Student Essays on American Science Fiction Film. Gottingen: Universitatsverlag Gottingen, 2011. p. 75-86.
McKinney, Richard L.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 448-450.
Locus No. 175:2. June 24, 1975.
Locus 11(6):2. August 1978.
SFWA Bulletin 10(2): 59. Fall 1974. (No. 53A)
Eisenberg, Adam; Shay, Don
Cinefex No. 20:4-67. January 1985.
Zentz, Gregory L.
New York: Praeger, 1991. 158pp.
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