Cita APA (7th ed.)

Christy, D. (1993). Essentials of precalculus algebra and trigonometry (5th ed.). Wm. C. Brown.

Cita Chicago (17th ed.)

Christy, Denis. Essentials of Precalculus Algebra and Trigonometry. 5th ed. Dubuque, Iowa: Wm. C. Brown, 1993.

Cita MLA (9th ed.)

Christy, Denis. Essentials of Precalculus Algebra and Trigonometry. 5th ed. Wm. C. Brown, 1993.