Perrier, E. (1925). Earth before history: Man's origin and the origin of earth. Kegan Paul.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPerrier, Edmond. Earth Before History: Man's Origin and the Origin of Earth. Kegan Paul, 1925.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPerrier, Edmond. Earth Before History: Man's Origin and the Origin of Earth. Kegan Paul, 1925.
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