Citace podle APA (7th ed.)

Heddens, J. W., & Speer, W. R. (1988). Today's mathematics. Concepts and methods in elementary school mathematics (6th ed.). Macmillan Publishers.

Citace podle Chicago (17th ed.)

Heddens, James W., a William R. Speer. Today's Mathematics. Concepts and Methods in Elementary School Mathematics. 6th ed. New York: Macmillan Publishers, 1988.

Citace podle MLA (9th ed.)

Heddens, James W., a William R. Speer. Today's Mathematics. Concepts and Methods in Elementary School Mathematics. 6th ed. Macmillan Publishers, 1988.

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