Server, Lee
in: Server, Lee. Encyclopedia of Pulp Fiction Writers. New York: Facts on File, 2002. p. 238-239.
No authors listed.
in: Bowers, Bill and Bill Mallardi. Double: Bill Symposium. Akron, OH: D:B Press, 1969.
Connolly, Thomas
In: Connolly, Thomas. After Human: a Critical History of the Human in Science Fiction From Shelley to Le Guin. Liverpool, UK: Liverpool University Press, 2021. p. 69-110.
Brooks, Rick
Double:Bill No. 21: 53-58. Fall 1969.
Youd, C. S.
Science Fiction Fan 4(5): 14-17. December 1939.
Science Fiction Times No. 433:4-8. November 1965.
Hamilton, Edmond
Vector 36:9-10. November 1965.
Langford, David
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. p. 1311-1314.
Ellik, Ron; Evans, William
Chicago: Advent, 1966. 272 p.
Kyle, David A.
Starlog 139:45-48, 57. February 1989.
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