Lerch, H. H. (1981). Teaching elementary school mathematics: An active learning approach]. Houghton Mifflin.
Citace podle Chicago (17th ed.)Lerch, Harold H. Teaching Elementary School Mathematics: An Active Learning Approach]. Boston: Houghton Mifflin, 1981.
Citace podle MLA (9th ed.)Lerch, Harold H. Teaching Elementary School Mathematics: An Active Learning Approach]. Houghton Mifflin, 1981.
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