Cita APA (7a ed.)
Silverberg, R. Needle in a Timestack. Ballantine Books.
Cita estilo Chicago (17a ed.)
Silverberg, Robert. Needle in a Timestack. Nueva York, EUA: Ballantine Books.
Cita MLA (9a ed.)
Silverberg, Robert. Needle in a Timestack. Ballantine Books.
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