Darwin, C., Barrett, P. H., & Freeman, R. B. (1986). The works of Charles Darwin: Ed. by Paul H. Barrett & R. B. Freeman. Pickering.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, Paul H. Barrett, agus R. B. Freeman. The Works of Charles Darwin: Ed. by Paul H. Barrett & R. B. Freeman. London: Pickering, 1986.
Lua MLA (8ú heag.)Darwin, Charles, et al. The Works of Charles Darwin: Ed. by Paul H. Barrett & R. B. Freeman. Pickering, 1986.
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