Cita APA (7a ed.)

Sobel, M. A., & Lerner, N. (1991). Algebra and trigonometry (4th ed.). Prentice hall.

Cita Chicago Style (17a ed.)

Sobel, Max A., y Norbert Lerner. Algebra and Trigonometry. 4th ed. Englewood cliffs: Prentice hall, 1991.

Cita MLA (9a ed.)

Sobel, Max A., y Norbert Lerner. Algebra and Trigonometry. 4th ed. Prentice hall, 1991.