Darwin, C., Barrett, P. H., & Freeman, R. B. (1988). Variation of animals and plants under domestication, 1. Pickering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDarwin, Charles, Paul H. Barrett, और R. B. Freeman. Variation of Animals and Plants Under Domestication, 1. London: Pickering, 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDarwin, Charles, et al. Variation of Animals and Plants Under Domestication, 1. Pickering, 1988.
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