Cita APA (7a ed.)
Schumacher, E. A Guide for the Perplexed. Harper Perennial.
Cita estilo Chicago (17a ed.)
Schumacher, E.F. A Guide for the Perplexed. Nueva York, EUA: Harper Perennial.
Cita MLA (9a ed.)
Schumacher, E.F. A Guide for the Perplexed. Harper Perennial.
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