Hill, R. J. (1960). A comparative study of lecture and discussion methods. U.S.A.: The Fund for Adult Education.
Παραπομπή Chicago StyleHill, Richard J. A Comparative Study of Lecture and Discussion Methods. U.S.A.: The Fund for Adult Education, 1960.
Παραπομπή MLAHill, Richard J. A Comparative Study of Lecture and Discussion Methods. U.S.A.: The Fund for Adult Education, 1960.
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