Cita APA (7th ed.)

Pettofrezzo, A. J. (1981). Intermediate algebra: A programmed approach. Scott, Foresman and Company.

Cita Chicago (17th ed.)

Pettofrezzo, Anthony J. Intermediate Algebra: A Programmed Approach. Glenview, Illinois: Scott, Foresman and Company, 1981.

Cita MLA (9th ed.)

Pettofrezzo, Anthony J. Intermediate Algebra: A Programmed Approach. Scott, Foresman and Company, 1981.