Sobel, M., & Maletsky, E. M. (1991). Teaching mathematics: A sourcebook of aids, activities and strategies (2nd ed.). Allyn and Bacon.
Čikaški stil citiranja (17. izdanje)Sobel, Max, i Evan M. Maletsky. Teaching Mathematics: A Sourcebook of Aids, Activities and Strategies. 2nd ed. Boston: Allyn and Bacon, 1991.
MLA način citiranja (9. izdanje)Sobel, Max, i Evan M. Maletsky. Teaching Mathematics: A Sourcebook of Aids, Activities and Strategies. 2nd ed. Allyn and Bacon, 1991.
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