APA (7th ed.) Citation

Yoakam, G. A., & Simpson, R. G. (1949). Directed study and observation of teaching (rev. ed.). Macmillan.

Chicago Style (17th ed.) Citation

Yoakam, Gerald Alan, and Robert G. Simpson. Directed Study and Observation of Teaching. rev. ed. New York: Macmillan, 1949.

MLA (9th ed.) Citation

Yoakam, Gerald Alan, and Robert G. Simpson. Directed Study and Observation of Teaching. rev. ed. Macmillan, 1949.