APA
Christiansen M. H., Kirby S., . (2003). Language evolution. Oxford: Oxford University Press.
Chicago
Christiansen Morten H, Kirby Simon, . 2003. Language evolution. Oxford: Oxford University Press.
Harvard
Christiansen M. H., Kirby S., . (2003). Language evolution. Oxford: Oxford University Press.
MLA
Christiansen Morten H, Kirby Simon, . Language evolution. Oxford: Oxford University Press. 2003.