McCluskey, Peter M.
Heinlein Journal No. 17: 9-14. July 2005.
Pringle, David
in: Pringle, David. Science Fiction: The 100 Best Novels. New York: Carroll and Graf, 1985. pp.73-74.
McGiveron, Rafeeq O.
Extrapolation 45(4): 370-387. Winter 2004.
Jewett, Jerry
Heinlein Journal No. 23: 41-42. July 2008.
Silverberg, Robert
in: Kondo, Yoji, ed. Requiem: New Collected Works by Robert A. Heinlein and Tributes to the Grand Master. New York: Tor, 1992. pp.322-327. Also in: Silverberg, Robert. Reflections and Refractions. Grass Velley: Underwood, 1997. pp.248-252.
Mallorqui, Cesar
Helice: Reflexiones críticas sobre ficción especulativa No. 9: 28-30. May 2008.
Kagan, Michael
Heinlein Journal No. 18: 54-59. January 2006.
Gifford, James
Heinlein Journal No. 3: 6-8. July 1998.
No authors listed.
Science Fiction Times No. 290:1. March 1958.
Moskowitz, Sam
Niekas 33:21-22. 1985.
Brown, Joseph F.
Extrapolation 49(1): 109-121. Spring 2008.
Gorsch, Robert
Heinlein Jouranl No. 21: 16-18. July 2007. (Issued Spring 2010)
Urrutia, Benjamin
in: Urrutia, Benjamin, ed. LDSF: Latter Day Science Fiction, No. 2. Ludlow, MA: Parables, 1985. p.105.
Edmonds, Lisa N.
Heinlein Journal No. 14: 7-10. January 2004.
Locus 59(2): 51-54. August 2007.
Locus 12(5):1. June 1979.
Locus 74(4): 10. April 2015.
Locus 55(1): 12. July 2005.
Sullivan, C. W., III
Journal of the Fantastic in the Arts 17(2): 169-180. Summer 2006.
Science Fiction Times No. 460:2. November 1968.
Ecken, Claude
In: Bellagamba, Ugo and Picholle, Eric, eds. Robert A. Heinlein et la pédagogie du reel. Villefranche-Sur-Mer: éditions du Somnium, 2008. p. 99-103.
Locus 51(5): 13. November 2003
Gorsch, Richard
Heinlein Journal No. 11: 9-10. July 2002.
Nathan, Paul
Publishers Weekly 241(41): 13. October 10, 1994.
Panshin, Alexei
Speculation 14:2-37. October 1966.
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