APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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