APA (7e ed.) Bronvermelding

Swokowski, E. W., & Cole, J. A. (1998). Precalculus: Functions and graphs (9th ed.). Brooks, Cole Pub. Co.

Chicago (17e ed.) Bronvermelding

Swokowski, Earl William, en Jeffery A. Cole. Precalculus: Functions and Graphs. 9th ed. Pacific Grove, CA: Brooks, Cole Pub. Co, 1998.

MLA (9e ed.) Bronvermelding

Swokowski, Earl William, en Jeffery A. Cole. Precalculus: Functions and Graphs. 9th ed. Brooks, Cole Pub. Co, 1998.