Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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