APA (7th ed.) Citation

Nilsen, D. L. F., & Nilsen, A. P. (1973). Pronunciation contrasts in English. Regents.

Chicago Style (17th ed.) Citation

Nilsen, Don Lee Fred, and Alleen Pace Nilsen. Pronunciation Contrasts in English. New York: Regents, 1973.

MLA (9th ed.) Citation

Nilsen, Don Lee Fred, and Alleen Pace Nilsen. Pronunciation Contrasts in English. Regents, 1973.

Warning: These citations may not always be 100% accurate.