Hantke, Steffen
Science Fiction Studies. 25(3): 495-509. November 1998.
Ormes, Marie G.
in: Wolf, Milton T. and Mallett, Daryl F., eds. Imaginative Futures: Proceedings of the 1993 Science Fiction Research Association Conference. San Bernardino, CA: Jacob's Ladder Books, 1995. pp.95-114.
Panshin, Alexei
EI 7(3): 8-71. June 2008. No. 38)
No authors listed.
Speculation 24: 1-39. September/October 1969.
Hartwell, D. G.
Crawdaddy p. 16. July 1973.
Blackmore, Tim
Extrapolation 36(2): 136-150. Summer 1995.
Driesslein, April A.
Honor's Thesis, St. Mary's University of San Antonio, Texas, 2001. 78 p.
Kimbler, Josh
Heinlein Journal No. 2(1): 39-42. Fall 2019. (No. 25)
Aneja, David K.
Master's Thesis, University of South Florida, 2002. 45 p.
Pak, Chris
Liverpool, UK: Liverpool University Press, 2016. 243 p.
Broderick, Damien
Journal of Consciousness Studies 19(1/2): 20-41. January/February 2012.
Patterson, Bill
Heinlein Journal No. 15: 5-36. July 2004.
Turtledove, Harry
in: Kondo, Yoji, ed. Requiem: New Collected Works by Robert A. Heinlein and Tributes to the Grand Master. New York: Tor, 1992. pp.328-332.
Resnick, Mike
Science Fiction Chronicle 22(12): 22. December 2001. (No. 219)
James, Robert
Heinlein Journal No. 8: 38-42. January 2001
Wheat, David L., Jr.
New York Review of Science Fiction 19(1): 1, 8-14, 16-18. September 2006. (No. 217)
Seymour, Gene
Baffler No. 24: 63-74. 2014
Locus 23(5):5. November 1989.
Sanders, Joe
New York Review of Science Fiction 14(9): 10-11. May 2002. (No. 165)
Moorman, Kenneth
Foundation No. 108: 10-27. Spring 2010.
Posadas, Baryon T.; Yoshio, Aramaki
Mechademia: Second Arc 14(1): 28-61. Fall 2021. 
https://doi.org/10.5749/mech.14.1.0028
Stover, Leon E.
Heinlein Journal No. 4: 3-4. January 1999.
McCluskey, Pete
Heinlein Journal No. 20: 23-25. January 2007.
Drake, Harold L.
General Semantics Bulletin 41/43: 132-149. Spring 1977.
Gorsch, Robert
Foundation No. 97: 47-58. Summer 2006.
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