APA (7th ed.) Citation

Ruhlen, M. A guide to the world's languages. Arnold.

Chicago Style (17th ed.) Citation

Ruhlen, Merritt. A Guide to the World's Languages. London [u.a.]: Arnold.

MLA (9th ed.) Citation

Ruhlen, Merritt. A Guide to the World's Languages. Arnold.

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