Gagne, R. M., & Briggs , L. (1979). Principles of instructional desing (2nd ed.). Holt,Rinehart and Winston.
Παραπομπή Chicago StyleGagne, Robert M., και Lesliej Briggs. Principles of Instructional Desing. 2nd ed. New York: Holt,Rinehart and Winston, 1979.
Παραπομπή MLAGagne, Robert M., και Lesliej Briggs. Principles of Instructional Desing. 2nd ed. Holt,Rinehart and Winston, 1979.
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