Tohutoro APA (7th ed.)
Gallup, G., & Evan Hill. (1960). The secrets of long life. Bernard Geis.
Tohutoru Kātū Chicago (17th ed.)
Gallup, George, me Evan Hill. The Secrets of Long Life. New York: Bernard Geis, 1960.
Tohutoro MLA (9th ed.)
Gallup, George, me Evan Hill. The Secrets of Long Life. Bernard Geis, 1960.
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