Heddens, J. W., & Speer, W. R. (1988). Today's Mathematics: Concepts and Methods in Elementary School Mathematics (6. ed.). SRA Pergamon.
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Citação norma Chicago
Heddens, James W., and William R. Speer. Today's Mathematics: Concepts and Methods in Elementary School Mathematics. 6. ed. Chicago: SRA Pergamon, 1988.
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Citação norma MLA
Heddens, James W., and William R. Speer. Today's Mathematics: Concepts and Methods in Elementary School Mathematics. 6. ed. SRA Pergamon, 1988.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.