Cita APA (7a ed.)
Kirst, H. H. The Seventh Day. Ace Books.
Cita estilo Chicago (17a ed.)
Kirst, Hans Hellmut. The Seventh Day. Nueva York, EUA: Ace Books.
Cita MLA (9a ed.)
Kirst, Hans Hellmut. The Seventh Day. Ace Books.
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