APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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