Moskowitz, Sam
Satellite 2(4): 100-111. April 1958. Reprinted in Science Fantasy No. 37, 1959. Reprinted in: Moskowitz, Sam. Explorers of the Infinite: Shapers of Science Fiction. New York: World, 1963. pp. 128-141. 
Reprinted in: Sawyer, Andy, ed. Science Fiction. New York: Routledge, 2020. Vol. 3, p. 21-29.
Kang, Minsoo
Cometas 33: 113-139. 2002.
Ashley, Mike
in: Tymn, M. B. and Ashley, Mike. Science Fiction, Fantasy, and Weird Fiction Magazines. Westport, CT: Greenwood, 1985. pp. 767-768.
Spelling, Ian
Starlog 345: 60-64. May 2006.
No authors listed.
Variety p. 45. June 15, 1988.
Williamson, Jack
Dallas, TX: Benbella Books, 2005. 356 p.
Schaafsma, Karen
in: Coyle, William. Aspects of Fantasy. Westport, CT: Greenwood, 1986. pp.61-71.
Yolen, Jane
Mythlore 11(3): 5-7. Winter/Spring 1985.
Mathews, Richard
in: Magill, Frank N., ed. Survey of Modern Fantasy Literature, Vol 5. Englewood Cliffs, NJ: Salem Press, Inc., 1983. pp. 2165-2170.
Science Fiction Chronicle 2(11):16. August 1981.
Locus 37(1): 68. July 1996.
Porter, Andrew I.
Science Fiction Chronicle 18(1): 40. October 1996.
Hlavaty, Arthur D.
in: Reid, Robin A., ed. Women in Science Fiction and Fantasy. Westport, CT: Greenwood, 2009. Volume 2, p. 329-330.
Science Fiction Chronicle 10(10):12. July 1989.
Chronicle 28(2): 19. February/March 2006. (No. 266)
Locus 53(2): 68. August 2004.
Llinares, Dario
in: Jones, Matthew and Omrod, Joan, eds. Time Travel in Popular Media: Essays on Film, Television, Literature and Video Games. Jefferson, NC: McFarland, 2015. p. 271-283.
Scapperotti, Dan
Cinefantastique 21(4): 13. February 1991.
Griffin, Scott T.
Burroughs Bulletin NS. No. 22: 18-25. April 1995.
Rusch, Kristine K.
in: Rusch, Kristine K., ed. Science Fiction Writers of America Handbook. Eugene, OR: Writer's Notebook Press, 1990. pp.140-142.
Armstrong, Isobel
in: Sage, Lorna, ed. Flesh and the Mirror: Essays on the Art of Angela Carter. London: Virago, 1994. p. 257-278.
Mascaro, Patricia Ellen
Master's Thesis, University of Windsor (Canada), 1994. 163 p. (MAI 34(2): 532. April 1996.)
Anderson, Poul
in: Sanz, Jose, ed. SF Symposium/FC Simposio. Rio de Janeiro: Institute do Cinema, 1969. p. 81-90.
Klossner, Michael
SFRA Newsletter No. 194: 10-15. January/February 1992.
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