APA (7th ed.) Citation

Pettofrezzo, A. J., & Armstrong, L. H. (1981). Intermediate algebra: A programmed approach. Scott, Foresman.

Chicago Style (17th ed.) Citation

Pettofrezzo, Anthony J., and Lee H. Armstrong. Intermediate Algebra: A Programmed Approach. Glenview, Ill: Scott, Foresman, 1981.

MLA (9th ed.) Citation

Pettofrezzo, Anthony J., and Lee H. Armstrong. Intermediate Algebra: A Programmed Approach. Scott, Foresman, 1981.