Gagne, E. D., Yekovich, C. W., & Yekovich, F. R. (1993). The cognitive psychology of school learning (2nd ed.). HarperCollins College Publishers.
Chicago-viite (17. p.)Gagne, Ellen D., Carol Walker Yekovich, ja Frank R. Yekovich. The Cognitive Psychology of School Learning. 2nd ed. New York: HarperCollins College Publishers, 1993.
MLA-viite (9. p.)Gagne, Ellen D., et al. The Cognitive Psychology of School Learning. 2nd ed. HarperCollins College Publishers, 1993.
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