Cita APA (7a ed.)
Silverberg, R. A Time of Changes. Signet : New American Library.
Cita estilo Chicago (17a ed.)
Silverberg, Robert. A Time of Changes. Nueva York, EUA: Signet : New American Library.
Cita MLA (9a ed.)
Silverberg, Robert. A Time of Changes. Signet : New American Library.
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