Marks, J. L., Purdy, R. C., & Kinney, L. B. (1965). Teaching elementary school mathematics for understanding (2nd ed.). McGraw-Hill.
Citace podle Chicago (17th ed.)Marks, John L., R. C. Purdy, a L. B. Kinney. Teaching Elementary School Mathematics for Understanding. 2nd ed. New York: McGraw-Hill, 1965.
Citace podle MLA (9th ed.)Marks, John L., et al. Teaching Elementary School Mathematics for Understanding. 2nd ed. McGraw-Hill, 1965.
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