Gagné, E. D., Yekovich, C. W., & Yekovich, F. R. (1993). The cognitive psychology of school learning (2a. ed.). Harpers Collins.
Chicago-viite (17. p.)Gagné, Ellen D., Carol Walker Yekovich, ja Frank R. Yekovich. The Cognitive Psychology of School Learning. 2a. ed. Nueva York: Harpers Collins, 1993.
MLA-viite (9. p.)Gagné, Ellen D., et al. The Cognitive Psychology of School Learning. 2a. ed. Harpers Collins, 1993.
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