Cita APA (7th ed.)
Darwin, C., & Beer, G. (2008). On the origin of species (Rev. ed.). Oxford University Press.
Cita Chicago (17th ed.)
Darwin, Charles, i Gillian Beer. On the Origin of Species. Rev. ed. New York: Oxford University Press, 2008.
Cita MLA (9th ed.)
Darwin, Charles, i Gillian Beer. On the Origin of Species. Rev. ed. Oxford University Press, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.