APA (7 वां संस्करण) प्रशस्ति पत्र
Degler, C. N. (1991). In search of human nature: The decline and revival of Darwinism in American social thought. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Degler, Carl N. In Search of Human Nature: The Decline and Revival of Darwinism in American Social Thought. New York: Oxford University Press, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Degler, Carl N. In Search of Human Nature: The Decline and Revival of Darwinism in American Social Thought. Oxford University Press, 1991.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.