Cita APA (7a ed.)

Haugen, E., & Dil, A. S. (1972). The ecology of language. California University Press.

Cita Chicago Style (17a ed.)

Haugen, Einar, y Anwar S. Dil. The Ecology of Language. Stanford, California: California University Press, 1972.

Cita MLA (9a ed.)

Haugen, Einar, y Anwar S. Dil. The Ecology of Language. California University Press, 1972.