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John Clute, eds, The Encyclopedia of Science Fiction: An Illustrated A to Z p.70 Ashley, "Beyond Fantasy Fiction", in Peter Nicholls and John Clute,
Romance 互联网档案馆的存檔，存档日期2008-01-08.; and John Clute, "Planetary Romance", in Encyclopedia of Science Fiction, ed. John Clute and Peter Nicholls, 1995, ISBN 0-312-13486-X
974. John Clute, "Lyon Sprague de Camp", in Clute & Grant, Encyclopedia of Fantasy, pp. 257–258. Mike Ashley, "Robert A. Heinlein", in Clute & Grant
Edgar Rice Burroughs Inc. Tarzan.org. [2013-05-30]. （原始内容存档于2017-06-29）. John Clute and Peter Nicholls, The Encyclopedia of Science Fiction, St. Martin's
Publishing. 1979. ISBN 0-586-05380-8. Peter Nicholls and John Clute, "Genre SF", in Clute, John; Nicholls, Peter. The Encyclopedia of Science Fiction. New