Darwin, C., Barrett, P. H., & Freeman, R. B. (1988). Variation of animals and plants under domestication, 2. Pickering.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, Paul H. Barrett, agus R. B. Freeman. Variation of Animals and Plants Under Domestication, 2. London: Pickering, 1988.
Lua MLA (8ú heag.)Darwin, Charles, et al. Variation of Animals and Plants Under Domestication, 2. Pickering, 1988.
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