Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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