Citazione Stile APA (7a Edizione)

Steffensen, A. R., & Johnson, L. M. (1981). Algebra and trigonometry. Scott, Foresman and Company.

Citazione stile Chigago Style (17a edizione)

Steffensen, Arnold R., e L. Murphy Johnson. Algebra and Trigonometry. Glenview, IL: Scott, Foresman and Company, 1981.

Citatione MLA (9a ed.)

Steffensen, Arnold R., e L. Murphy Johnson. Algebra and Trigonometry. Scott, Foresman and Company, 1981.