Darwin, C., Barrett, P. H., Freeman, R. B., & Darwin, F. (1989). The different forms of flowers on plants of the same species. Pickering.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, Paul H. Barrett, R. B. Freeman, agus Francis Darwin. The Different Forms of Flowers on Plants of the Same Species. London: Pickering, 1989.
Lua MLA (8ú heag.)Darwin, Charles, et al. The Different Forms of Flowers on Plants of the Same Species. Pickering, 1989.
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