APA (7th ed.) Citation

McMahon, A. M. S., & McMahon, R. (2005). Language classification by numbers. Oxford University Press.

Chicago Style (17th ed.) Citation

McMahon, April M. S., and Robert McMahon. Language Classification by Numbers. Oxford ; New York: Oxford University Press, 2005.

MLA (9th ed.) Citation

McMahon, April M. S., and Robert McMahon. Language Classification by Numbers. Oxford University Press, 2005.