Gallup, G., & Evan Hill. (1960). The secrets of long life. Bernard Geis.
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Citación estilo Chicago
Gallup, George, and Evan Hill. The Secrets of Long Life. New York: Bernard Geis, 1960.
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Cita MLA
Gallup, George, and Evan Hill. The Secrets of Long Life. Bernard Geis, 1960.
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Warning: These citations may not always be 100% accurate.