Wright, A. L. (1973). Let's learn English: Intermediate course: 3 (2a. ed.). American Book Company.

Wright, Audrey L. Let's Learn English: Intermediate Course: 3. 2a. ed. New York: American Book Company, 1973.

Wright, Audrey L. Let's Learn English: Intermediate Course: 3. 2a. ed. American Book Company, 1973.