Spelling, Ian
Starlog 279: 78-80. October 2000.
Wagner, Chuck
Cinefantastique 34(2): 20-21. April 2002.
No authors listed.
Locus 15(4):19. April 1982.
Locus 51(6): 81. December 2003.
Rutledge, Amelia A.
in: Cowart, David, ed. Twenieth-Century American Science-Fiction Writers, Part 1: A-L. Detroit: Gale, 1981. pp. 192-193. (Dictionary of Literary Biography, v. 8)
Campbell, Ramsey
In: Campbell, Ramsey Certainly: Essays and Reviews 2002-2017, ed. by S. T. Joshi. Hornsea, UK: PS Publishing, 2022. p. 311-314.
Locus 44(3): 69. March 2000.
Locus 67(1): 66. July 2011.
Clark, Jim
Cinefantastique 17(5):44. September 1987.
Elefante-Gordon, Juanita
Starlog 128: 62-63. March 1988.
Hill, Darci
Mythlore 22(2): 22-27. Summer 1998. (No. 84)
Science Fiction Chronicle 22(10): 12. October 2001. (No. 217)
Clareson, Thomas D.
in: Bleiler, E. F., ed. Supernatural Fiction Writers. New York: Scribner's, 1985. pp.761-768.
Franklin, H. Bruce
in: Franklin, H. Bruce. Future Perfect: American Science Fiction of the Nineteenth Century. Revised and Expanded Edition. New Brunswick, NJ: Rutgers University Press, 1995. pp.370-375.
Cummings, Sherwood
Baton Rouge: Louisiana State University Press, 1988. 224pp.
Ketterer, David
in: Rasmussen, R. Kent, Ed. Critical Insights: Mark Twain. Pasadena, CA: Salem Press, 2011. p. 261-288. (Reprinted from Twain, Mark. The Science Fiction of Mark Twain. Hamden, CT. : Archon Books, 1984. p. xiii-xxxiii)
Coyle, William
in: Coyle, William. Aspects of Fantasy. Westport, CT: Greenwood, 1986. pp.175-180.
Crow, Jonathan
Open Culture Blog. November 11, 2014. http://www.openculture.com/2014/11/mark-twain-predicts-the-internet-in-1898-read-his-sci-fi-crime-story-from-the-london-times-in-1904.html Accessed 12.November.2014.
Le Guin, Ursula K.
in: Le Guin, Ursula K. The Wave in the Mind. Boston, Shambhala, 2004. p. 46-56.
Kaufman, William K.
Ph.D. Dissertation, University of Wales, Aberystwyth, 1992. [Not Seen.]
Amare, Nicole; Manning, Alan
Mark Twain Annual 21: 40–60. 2023. 
https://doi.org/10.5325/marktwaij.21.1.0040
Locus 67(4): 66. October 2011.
Chocholak, Misha
New Pathways Into Science Fiction and Fantasy 1(6):29-32. January 1987.
Hoffman, Donald L.
in: Slocum, Sally K., ed. Popular Arthurian Traditions. Bowling Green, OH: Popular Press, 1992. pp.46-55.
Yanora, Mercedes
In: Lewis, A. David and Lund, Martin, eds. Muslim Superheroes Comics, Islam, and Representation. Cambridge: Harvard University Press, 2023. p. 110-133.
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