Yoakam, G. A., & Simpson, R. G. (1949). Directed study and observation of teaching (rev. ed.). Macmillan.
Cita Chicago Style (17a ed.)Yoakam, Gerald Alan, y Robert G. Simpson. Directed Study and Observation of Teaching. rev. ed. New York: Macmillan, 1949.
Cita MLA (9a ed.)Yoakam, Gerald Alan, y Robert G. Simpson. Directed Study and Observation of Teaching. rev. ed. Macmillan, 1949.
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