Cita APA (7th ed.)

Swokowski, E. W. (1990). Precalculus functions and graphs (6th ed.). PWS-Kent.

Cita Chicago (17th ed.)

Swokowski, Earl W. Precalculus Functions and Graphs. 6th ed. Boston: PWS-Kent, 1990.

Cita MLA (9th ed.)

Swokowski, Earl W. Precalculus Functions and Graphs. 6th ed. PWS-Kent, 1990.