APA (7th ed.) Citation

Campbell, G. L. (1995). Concise compendium of the world's languages. Routledge.

Chicago Style (17th ed.) Citation

Campbell, George L. Concise Compendium of the World's Languages. London: Routledge, 1995.

MLA (9th ed.) Citation

Campbell, George L. Concise Compendium of the World's Languages. Routledge, 1995.