Cita APA (7th ed.)

Larson, R., Hostetler, R. P., Edwards, B. H., & Heyd, D. E. (1994). Precalculus: Functions and graphs : a graphing approach. D.C. Heath and Company.

Cita Chicago (17th ed.)

Larson, Ron, Robert P. Hostetler, Bruce H. Edwards, i David E. Heyd. Precalculus: Functions and Graphs : A Graphing Approach. Lexington, Massachusetts: D.C. Heath and Company, 1994.

Cita MLA (9th ed.)

Larson, Ron, et al. Precalculus: Functions and Graphs : A Graphing Approach. D.C. Heath and Company, 1994.