APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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