Cita APA (7a ed.)

Ruhlen, M. (1991). A guide to the world's languages. Stanford University Press.

Cita Chicago Style (17a ed.)

Ruhlen, Merritt. A Guide to the World's Languages. Stanford (California): Stanford University Press, 1991.

Cita MLA (9a ed.)

Ruhlen, Merritt. A Guide to the World's Languages. Stanford University Press, 1991.