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.
Chicago-referens (17:e uppl.)Darwin, Charles, och 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.
MLA-referens (8:e uppl.)Darwin, Charles, och 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.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.