Heddens, J. W. (1979). Todays mathematics: Concepts and methods in elementary school mathematics (4th ed.). S.R.A.
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Citação norma Chicago
Heddens, James W. Todays Mathematics: Concepts and Methods in Elementary School Mathematics. 4th ed. Chicago: S.R.A, 1979.
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Citação norma MLA
Heddens, James W. Todays Mathematics: Concepts and Methods in Elementary School Mathematics. 4th ed. S.R.A, 1979.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.