APA (7th ed.) Citation

Wright, A. L., Van Syoc, W. B., & Van Syoc, F. S. (1973). Let's learn English: Intermediate course. American Book company.

Chicago Style (17th ed.) Citation

Wright, Audrey L., W. Bryce Van Syoc, and Florence S. Van Syoc. Let's Learn English: Intermediate Course. New York: American Book company, 1973.

MLA (9th ed.) Citation

Wright, Audrey L., et al. Let's Learn English: Intermediate Course. American Book company, 1973.