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*Browell, W. A. (1939). Learning as reorganization: An experimental study in third-grade arithmetic, Duke University Press. {{eng oznaka}}
*Subtraction in the United States: An Historical Perspective, Susan Ross, Mary Pratt-Cotter, ''The Mathematics Educator'', Vol. 8, No. 1 (original publication) and Vol. 10, No. 1 (reprint.) http://math.coe.uga.edu/TME/Issues/v10n2/5ross.pdf {{eng oznaka}}
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[[Kategorija:Aritmetika]]