Cita APA (7th ed.)

KEEDY, M. L., & BITTINGER, M. L. (1989). Developmental mathematics.-- Ed.2. Addison-Wesley.

Cita Chicago (17th ed.)

KEEDY, Mervin L., i Marvin L. BITTINGER. Developmental Mathematics.-- Ed.2. Reading: Addison-Wesley, 1989.

Cita MLA (9th ed.)

KEEDY, Mervin L., i Marvin L. BITTINGER. Developmental Mathematics.-- Ed.2. Addison-Wesley, 1989.