Roberts, Adam
in: Mamczak, Sascha and Jeschke, Wolfgang, eds. Das Science Fiction Jahr, 2005. Munchen: Heyne, 2005. p. 376-401.
Bruce, Samuel W.
in: Harris-Fain, Darren, ed. British Fantasy and Science Fiction Writers Before World War I. Detroit, MI: Gale Research, 1997. pp.121-131.
No authors listed.
Locus 17(3):1,42. March 1984.
Carnell, Corbin S.
in: Harris-Fain, Darren, ed. British Fantasy and Science Fiction Writers Before World War I. Detroit, MI: Gale Research, 1997. pp.188-199.
Stableford, Brian
in: Stableford, Brian. Opening Minds: Essays on Fantastic Literature. San Bernardino, CA: Borgo Press, 1995. pp.15-22.; also in; Sawyer, Andy, ed. Science Fiction. New York: Routledge, 2020. Vol. 1, p. 73-79.
Stableford, Brian M.
Foundation 10:6-12. June 1976.
Bleiler, Richard
Science Fiction Studies 38(3): 562-564. November 2011.
Moskowitz, Sam
Fantasy Review 10(3):16-19. April 1987.
Fantasy Review 10(2):12-15, 52-53. March 1987.
Kittredge, Katharine
Science Fiction Studies 34(1): 19-41. March 2007.
Molson, Francis J.
Extrapolation 25(1): 34-49. Spring 1984.
Hahn, Ronald M.
in: Barmeyer, Eike, ed. Science fiction: theorie und geschichte. Munchen: Fink, 1972. p. 219-243..
Bernat, Sarah
Hamburg: Diplomica-Verlag, 2012. 99 p.
Fantasy Times No. 152: 4. April 1952.
Lowndes, Robert A. W.
Science Fiction Fan 3(3): 5-10, 17. October 1938.
Davidson, Jane P.
Journal of the Fantastic in the Arts 2(4):47-67. 1990
Davin, Eric L.
Fantasy Commentator 9(3): 228-229. Fall 1998. (No. 51)
Yaszek, Lisa
Extrapolation 45(1): 34-51. Spring 2004. in: Latham, Rob, ed. Science Fiction Criticism: An Anthology of Essential Writings. New York: Bloomsbury, 2017. p. 268-283.
Donawerth, Jane L.
In: Canavan, Gerry and Link, Eric C. eds. The Cambridge History of Science Fiction. New York : Cambridge University Press, 2019. p. 232-246.
Johns, Alessa
Urbana: University of Illinois Press, 2003. 212 p.
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.312-316.
Pohl, Nicole
Burlington, VT: Ashgate, 2006. 200 p.
Williamson, Jack
Amazing 68(9): 27-28. Winter 1994.
New York: Bluejay, 1984. 276 p.
Lambert, P. C.
Alabama Librarian 8(1):3-5. January 1957.
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