APA (7th ed.) Citation

Bloomfield, M. W., & Haugen, E. I. (1974). Language as a human problem. Norton.

Chicago Style (17th ed.) Citation

Bloomfield, Morton W., and Einar Ingvald Haugen. Language as a Human Problem. New York: Norton, 1974.

MLA (9th ed.) Citation

Bloomfield, Morton W., and Einar Ingvald Haugen. Language as a Human Problem. Norton, 1974.