Cita APA (7th ed.)

Haugen, E. I. (1972). The ecology of language. Stanford University Press.

Cita Chicago (17th ed.)

Haugen, Einar Ingvald. The Ecology of Language. Stanford, Calif: Stanford University Press, 1972.

Cita MLA (9th ed.)

Haugen, Einar Ingvald. The Ecology of Language. Stanford University Press, 1972.