Langford, David
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 360-363.
Cohen, Lon S.
SFWA Bulletin 40(3): 15-17. Winter 2007. (No. 172)
Macklin, Richard H.
Science Fiction Quarterly 5(2): 87-91. August 1957.
Science Fiction Quarterly 4(6): 64-77. February 1957.
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