Denworth, L. (2020). Friendship: The evolution, biology, and extraordinary power of life's fundamental bond (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDenworth, Lydia. Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond. First edition. New York, NY: W.W. Norton & Company, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDenworth, Lydia. Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond. First edition. W.W. Norton & Company, 2020.
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