Swain, R. L. (1965). Understanding Arithmetic. New York: Holt, Rinehart and Wiston.
Trích dẫn kiểu ChicagoSwain, Robert L. Understanding Arithmetic. New York: Holt, Rinehart and Wiston, 1965.
Deismireacht MLASwain, Robert L. Understanding Arithmetic. New York: Holt, Rinehart and Wiston, 1965.
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