No authors listed.
Variety p. 32. November 5, 1969.
Troster, Horst G.
in: Jeschke, Wolfgang, ed. Das Science Fiction Jahr No. 8. München: Heyne, 1993. p. 554-572.
Doctorow, Cory
Locus 76(1): 27, 43-44. January 2016.
Fantasy Times No. 263:3. January (2) 1957.
Fantasy Times No. 268:1,5. April (1) 1957.
Locus 65(6): 13. December 2010.
Sherman, Fraser A.
Jefferson, NC: McFarland, 2005. 275 p.
Samerdyke, Michael
Independently Published, 2021, 305 p.
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