APA (7th ed.) Citation

(1977). The languages of the world. Routledge and Kegan Paul.

Chicago Style (17th ed.) Citation

The Languages of the World. London: Routledge and Kegan Paul, 1977.

MLA (9th ed.) Citation

The Languages of the World. Routledge and Kegan Paul, 1977.

Warning: These citations may not always be 100% accurate.