1. ^ Clute and Nicholls 1995, p. 496.
  2. ^ Pringle 1990, p. 149.
  • Clute, John and Peter Nicholls. The Encyclopedia of Science Fiction. New York: St. Martin's Griffin, 1993 (2nd edition 1995). ISBN 0-312-13486-X.
  • Pringle, David. The Ultimate Guide to Science Fiction. London: Grafton Books, 1990. ISBN 0-246-13635-9.

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