APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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