Pohl, Frederik
New York Review of Science Fiction No. 17: 1, 8-9. January 1990.
Tharp, Sarah Anne
Ph. D. Dissertation, Baylor University, 2023. 274 p. (DAI-A 85(2)(E).) Embargoed until August 12, 2028.
Scharnhorst, Gary
Columbia: University of Missouri Press, 2022. 800 p.
Yu, Daeshik
Ph. D. Dissertation, University of Washington, 1983. 284 p. (DAI-A 44(4).)
Morus, Iwan R.
in: Rees, Amanda; Morus, Iwan R. Presenting Futures Past: Science Fiction and the History of Science. Chicago: University of Chicago Press, 2019. p. (Osirus 34(1): 19-35. 2019.)
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
Hoffman, Donald L.
in: Slocum, Sally K., ed. Popular Arthurian Traditions. Bowling Green, OH: Popular Press, 1992. pp.46-55.
Eckley, Wilton
in: Magill, Frank N., ed. Survey of Modern Fantasy Literature, Vol 3. Englewood Cliffs, NJ: Salem Press, Inc., 1983. pp. 1081-1085.
Pratter, F. E.
in: Roemer, Kenneth M., ed. American As Utopia. New York: Franklin, 1981. pp. 78-90.
LeGere, John C.
Heinlein Journal No. 7: 15-23. July 2000.
Khouri, Nadia
Ph. D. Dissertation, McGill University, 1983. 490 frames on 5 microfiche. (DAI-A 44(9): 2767. March 1984.)
Cree, Charles George
Ph. D. Dissertation, Indiana University, 1980. 190 p. (DAI-A 41(9): 4032. March 1981.)
Alquesta, Andrew J.
Ph. D. Dissertation, Tufts University, 2022. 193 p. (DAI-A 83(11)(E).)
Lamb, Robert P.
in: Fulton, Helen, ed. A Companion to Arthurian Literature. Malden, MA: Wiley-Blackwell, 2009. p. 403-419.
in: Slusser, George E., ed. Bridges to Fantasy. Carbondale: Southern Illinois University Press, 1982. pp. 130-141.
Boeckmann, Catherine A.
Ph. D. Dissertation, University of California, Irvine, 1997. 258pp.
Evans, Taylor Scott
Ph. D. Dissertation, University of California, Riverside, 2018. 349 p. (DAI-A 77(9)(E).) https://escholarship.org/uc/item/90d94068#main
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