- ^ Chalker, Jack L.; Mark Owings (1998). The Science-Fantasy Publishers: A Bibliographic History, 1923–1998. Westminster, MD and Baltimore: Mirage Press, Ltd. p. 308.
- ^ The Heritage of Heinlein: A Critical Reading of the Fiction, by Thomas D. Clareson and Joe Sanders; p. 45; published January 23, 2014 by McFarland & Company
- ^ Evaporating Genre: Strategies of Dissolution in the Postmodern Fantastic", by Gary K. Wolfe, in Edging Into the Future: Science Fiction and Contemporary Cultural Transformation, edited by Veronica Hollinger and Joan Gordon; published 2002 by University of Pennsylvania Press
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