Sagiv-Nakdimon, Inbal
Master's Thesis, Tel-Aviv University, 1999. v, 239 p. (Cited from www.sf-f.org.il/static/sagiv1.htm
Quinn, Stacey Jill
Master's Thesis, University of Mississippi, 1989. 89pp.
Stephensen-Payne, Phil
Albuquerque, NM: Galactic Central, 1992. 38pp.
Leeds, UK: Galactic Central, 2002. 30 p.
Kan, Katharine L.
Honolulu: Hawaii State Public Library System, 1990. 39pp.
Frank, Frederick S.
Metuchen, NJ: Scarecrow, 1988. 298pp.
Books, Ned
Lilburn, GA: Ned Brooks, 2012. 612 p. 
https://fanac.org/fanzines/References/ned_brooks_fanzine_index.pdf
Kononenko, V. O.; Loi, V. M.
Kylv: Derzhavan biblioteke Ukrainy, 1992. 35pp. [Not seen.]
Little, Chris E.
Wellsian: The Journal of the H. G. Wells Society No. 16: 42-44. 1993.
Tankard, Paul
Notes and Queries 65(3): 432-438. September 2018.
Calvin, Ritch
Utopian Studies 19(3): 485-516. 2008.
Samuelson, David N.
Science Fiction Studies 20(2): 149-156. July 1993.
White, William
American Book Collector, 22(5): 29. February 1972.
Bloch, Robert N.
Giessen: Lindenstruth, 2011. 52 p.
De Bolt, Joe
in: Tymn, Marshall B., ed. The Science Fiction Reference Book. Mercer Island, WA.: Starmont House, 1981. pp. 291-337.
Sachlas, Demos
Burroughs Bulletin No. 100-102 (New Series): 12-14. 2019/2020.
Edwards, Scott; Schafer, Chris
Books Are Everything 4(4; [#20]):73-74. December 1991.
Ward, Cynthia W.
Internet Review of Science Fiction 3(9): [16 p.] Fall 2006. (www.irosf.com)
Chamberlain, Gordon B.; Hacker, Barton C.
in: Waugh, Charles G., ed. Alternative Histories. New York: Garland, 1986. pp.301-363.
Extrapolation 22(4): 334-379. Winter 1981.
Rotondo, Fernando
Milano: Bibliografica, 2013. 127 p.
Utter, Virgil
Elleman, Barbara
Booklist 81(19): 1407-1408. June 1, 1985.
Adams, John J.
The Internet Review of Science Fiction 1(1): [5 p.] January 21, 2004. (http://www.irosf.com)
Stanley, Colin
London: Pauper's Press, 2020. 2 volumes (709 pages) Fifth Enlarged Edition. Noted as Out-of-Print, no OCLC holdings, 2021.
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