Cita APA (7a ed.)
Hill, E., & Lafferty, R. Pity About Earth. Ace Books.
Cita estilo Chicago (17a ed.)
Hill, Ernest, y R.A Lafferty. Pity About Earth. Nueva York, EUA: Ace Books.
Cita MLA (9a ed.)
Hill, Ernest, y R.A Lafferty. Pity About Earth. Ace Books.
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