APA (7th ed.) Citation

Katzner, K. (1986). The languages of the world (Rev. ed.). Routledge & Kegan Paul.

Chicago Style (17th ed.) Citation

Katzner, Kenneth. The Languages of the World. Rev. ed. London: Routledge & Kegan Paul, 1986.

MLA (9th ed.) Citation

Katzner, Kenneth. The Languages of the World. Rev. ed. Routledge & Kegan Paul, 1986.