APA引文

Heddens, J. W., & Speer, W. R. (1997). Today's mathematics (9th ed.). Merrill.

Chicago Style (17th ed.) Citation

Heddens, James W., and William R. Speer. Today's Mathematics. 9th ed. Upper Saddle River, N.J: Merrill, 1997.

MLA引文

Heddens, James W., and William R. Speer. Today's Mathematics. 9th ed. Merrill, 1997.