Sobel, M., & Maletsky, E. M. (1991). Teaching mathematics: A sourcebook of aids, activities and strategies (2nd ed.). Allyn and Bacon.
Цитирование в стиле Чикаго (17-е изд.)Sobel, Max, и Evan M. Maletsky. Teaching Mathematics: A Sourcebook of Aids, Activities and Strategies. 2nd ed. Boston: Allyn and Bacon, 1991.
Цитирование MLA (9-е изд.)Sobel, Max, и Evan M. Maletsky. Teaching Mathematics: A Sourcebook of Aids, Activities and Strategies. 2nd ed. Allyn and Bacon, 1991.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.