Darwin, C., & Burrow, J. W. (1985). The origin of species: By means of natural selection or the preservation of favoured races in the struggle for life / Charles Darwin. Ed. with an introd. by J. W. Burrow. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, agus John W. Burrow. The Origin of Species: By Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life / Charles Darwin. Ed. with an Introd. by J. W. Burrow. London [u.a.]: Penguin Books, 1985.
Lua MLA (8ú heag.)Darwin, Charles, agus John W. Burrow. The Origin of Species: By Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life / Charles Darwin. Ed. with an Introd. by J. W. Burrow. Penguin Books, 1985.
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