Cita APA (7th ed.)
Larson, R., Heyd, D. E., & Hostetler, R. P. (1989). Precalculus (2nd ed.). D.C. Heath.
Cita Chicago (17th ed.)
Larson, Ron, David E. Heyd, i Robert P. Hostetler. Precalculus. 2nd ed. Lexington, Mass.: D.C. Heath, 1989.
Cita MLA (9th ed.)
Larson, Ron, et al. Precalculus. 2nd ed. D.C. Heath, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.