No authors listed.
Science Fiction Chronicle 14(1): 4. October 1992.
Elkin, Alicia
Daily Athenaeum March 29, 2011. (http://www.the daonline.com/) (Accessed 29 June 2011.)
de Camp, L. Sprague
Magazine of Fantasy and Science Fiction 31(4): 32-35. October 1966.
Asimov, Stanley
New York: Doubleday, 1995. 332pp.
Asimov, Isaac
New York: Doubleday, 1996. 332pp.
Platt, Charles
in: Alpers, Joachim and Pusch, Harald, eds. Isaac Asimov: Der Tausendjahresplaner. Meitingen: Corian Verlag, 1984. p. 13-20.
Sawyer, Andy
Vector 115: 21-27. 1983.
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