Cita APA (7th ed.)

Steffensen, A. R., & Johnson, L. M. (1991). Intermediate algebra (4th ed.). HarperCollins.

Cita Chicago (17th ed.)

Steffensen, Arnold R., i L. Murphy Johnson. Intermediate Algebra. 4th ed. New York: HarperCollins, 1991.

Cita MLA (9th ed.)

Steffensen, Arnold R., i L. Murphy Johnson. Intermediate Algebra. 4th ed. HarperCollins, 1991.