Gaya APA

Nilsen, D, L., Pace, I, N, A. (1973). Pronunciation contrasts in english . New York: New York: Regents; 1973.

Gaya MLA

Nilsen, Don, L.F., Pace, I., Nilsen,, Alleen. "Pronunciation contrasts in english". New York: New York: Regents; 1973, 1973. Text.