APA (7th ed.) Citation

Campbell, L., & Poser, W. J. (2008). Language classification: History and method. Cambridge University Press.

Chicago Style (17th ed.) Citation

Campbell, Lyle, and William John Poser. Language Classification: History and Method. Cambridge, UK ; New York: Cambridge University Press, 2008.

MLA (9th ed.) Citation

Campbell, Lyle, and William John Poser. Language Classification: History and Method. Cambridge University Press, 2008.