Heldreth, Leonard G.
Journal of the Fantastic in the Arts 3(4): 93-106. 1994.
Mayer, Lester, Jr.
Fantasy Times No. 138:11-12. September (2) 1951.
Costello, Matthew J.
in: Greenberg, Martin H., Ed Gorman and Bill Munster, eds. The Dean Koontz Companion. New York: Berkley, 1994. pp.101-146.
Shepard, Lucius
Magazine of Fantasy and Science Fiction 106(4): 120-124. April 2004.
Ellison, Harlan
Magazine of Fantasy and Science Fiction 79(1): 98-109. July 1990.
No authors listed.
Variety p. 46. February 21, 1979.
Locus 13(1):3. January 1980.
Caronia, Antonio; Tursi, Antonio
Milano: Mimesis, 2010. 195 p.
Vukovic, Vuk
In Medias Res 8(14): 2219–2229. May 2019.
Syson, Antonia
in: Rogers, Brett M. and Stevens, Benjamin E., eds. Classical Traditions in Modern Fantasy. New York: Oxford University Press, 2017. p. 233-249.
Silverberg, Robert
Asimov's Science Fiction 40(1): 6-9. January 2016. Reprinted in: Silverberg, Robert. Living in the Future: Robert Silverberg on Science Fiction. Framingham MA: NESFA Press, 2023. p. 463-467.
Pottier, Jean-Michel
in: Huftier, Arnaud, ed. La Belgique: un jeu de cartes? De Rosny aine a Jacques Brel. Valenciennes: Presses universitaires de Valenciennes, 2003. p. 193-210.
Raulet, Gerard
in: Saccaro Del Buffa, Giuseppa and Lewis, Arthur O., eds. Utopia e Modernita: Teorie e prassi utopiche nell'eta moderna e postmoderna. Rome: Gangemi Editore, 1989. pp.111-127.
Sullivan, Jose
Alambique: Revista academica de ciencia ficcion y fantasia 8(1): Article 3. 2020. https://digitalcommons.usf.edu/alambique/vol8/iss1/3
Kincaid, Paul
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 291-293.
Compere, Daniel
Europe No. 681/682: 29-36. Janvier/Fevrier 1986.
Caillens, Pierre
Libourne: Godeau & L'Annonce-Bouquins, 1994. 497 p. 
Edition: [2. éd.].
James, Simon J.
in: McLean, Steven, ed. H. G. Wells: Interdisciplinary Essays. Newcastle, UK: Cambridge Scholars Publishing, 2008. p. 34-48.
Mousoutzanis, Aris
New York: Palgrave Macmillan, 2014. 258 p.
Wang, David D.
Sanford, CA: Stanford University Press, 1997. 421pp.
Science Fiction Chronicle 21(2): 6-7. February/March 2000.
Science Fiction Chronicle 22(11): 7. November 2001. (No. 218)
Moir, Mike
Matrix 60:7. August/September 1985.
Verniere, James
Boston (MA) Herald. May 22, 1992. in: NewsBank. Film and Television. 49:C5-C6. 1992.
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