Morton, R. L. (1937). Teaching arithmetic in elementary school. Silver Burdett company.
Citace podle Chicago (17th ed.)Morton, Robert Lee. Teaching Arithmetic in Elementary School. New York, boston [etc.]: Silver Burdett company, 1937.
Citace podle MLA (9th ed.)Morton, Robert Lee. Teaching Arithmetic in Elementary School. Silver Burdett company, 1937.
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