Gaya APA

Keedy, M, L., Bittinger, M, L. (1989). Developmental mathematics (2nd ed.). Massachusetts: Addison-Wesley Publishing Company.

Gaya MLA

Keedy, Mervin, L.., Bittinger, Marvin, L.. "Developmental mathematics". 2nd ed. Massachusetts: Addison-Wesley Publishing Company, 1989. Text.