Ruhlen, M. (1987). A guide to the world's languages. E. Arnold.
Lua i Stíl Chicago (17ú heag.)Ruhlen, Merritt. A Guide to the World's Languages. London: E. Arnold, 1987.
Lua MLA (9ú heag.)Ruhlen, Merritt. A Guide to the World's Languages. E. Arnold, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.