Tohutoro APA (7th ed.)
Conklin, G. 12 Great Classics of Science Fiction. Fawcett Gold Medal.
Tohutoru Kātū Chicago (17th ed.)
Conklin, Groff. 12 Great Classics of Science Fiction. Greenwich, EUA: Fawcett Gold Medal.
Tohutoro MLA (9th ed.)
Conklin, Groff. 12 Great Classics of Science Fiction. Fawcett Gold Medal.
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