Citazione Stile APA (7a Edizione)
Heddens, J. W., & Speer, W. R. (1988). Today's Mathematics: Concepts and Methods in Elementary School Mathematics (6.Edition.). Macmillan Publishing Company.
Citazione stile Chigago Style (17a edizione)
Heddens, James W., e William R. Speer. Today's Mathematics: Concepts and Methods in Elementary School Mathematics. 6.Edition. New York: Macmillan Publishing Company, 1988.
Citatione MLA (9a ed.)
Heddens, James W., e William R. Speer. Today's Mathematics: Concepts and Methods in Elementary School Mathematics. 6.Edition. Macmillan Publishing Company, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.