Cita APA (7th ed.)
Kaufmann, J. E. (1991). Precalculus (2nd ed.). PWS-KENT Pub. Co..
Cita Chicago (17th ed.)
Kaufmann, Jerome E. Precalculus. 2nd ed. Boston: PWS-KENT Pub. Co., 1991.
Cita MLA (9th ed.)
Kaufmann, Jerome E. Precalculus. 2nd ed. PWS-KENT Pub. Co., 1991.
Atenció: Aquestes cites poden no estar 100% correctes.