APA (7th ed.) Citation

Strayer, G. D., Frasier, G. W., & Armentrout, W. D. (1936). Principles of teaching. American Book.

Chicago Style (17th ed.) Citation

Strayer, George Drayton, George Willard Frasier, and Winfield Dockery Armentrout. Principles of Teaching. New York: American Book, 1936.

MLA (9th ed.) Citation

Strayer, George Drayton, et al. Principles of Teaching. American Book, 1936.