Tohutoro APA (7th ed.)
Asimov, I. (1978). I premi Hugo 1955-1975. Nord.
Tohutoru Kātū Chicago (17th ed.)
Asimov, Isaac. I Premi Hugo 1955-1975. Milano: Nord, 1978.
Tohutoro MLA (9th ed.)
Asimov, Isaac. I Premi Hugo 1955-1975. Nord, 1978.
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