Darwin, C., & Beer, G. (1996). The origin of species. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, agus Gillian Beer. The Origin of Species. Oxford: Oxford University Press, 1996.
Lua MLA (9ú heag.)Darwin, Charles, agus Gillian Beer. The Origin of Species. Oxford University Press, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.