Cita APA (7a ed.)

Christiansen, M. H., & Kirby, S. (2003). Language evolution. University Press.

Cita Chicago Style (17a ed.)

Christiansen, Morten H., y Simon Kirby. Language Evolution. Oxford [etc.]: University Press, 2003.

Cita MLA (9a ed.)

Christiansen, Morten H., y Simon Kirby. Language Evolution. University Press, 2003.