Cruikshank, D. E. (1992). Teaching and learning elementary and middle school mathematics (2nd ed.). Merrill.
Citace podle Chicago (17th ed.)Cruikshank, Douglas E. Teaching and Learning Elementary and Middle School Mathematics. 2nd ed. New York: Merrill, 1992.
Citace podle MLA (9th ed.)Cruikshank, Douglas E. Teaching and Learning Elementary and Middle School Mathematics. 2nd ed. Merrill, 1992.
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