APA-referens (7:e uppl.)

Swokowski, E. W., & Cole, J. A. (2019). Precalculus: Functions and graphs (Thirteenth edition.). Cengage.

Chicago-referens (17:e uppl.)

Swokowski, Earl William, och Jeffery A. Cole. Precalculus: Functions and Graphs. Thirteenth edition. Boston, MA: Cengage, 2019.

MLA-referens (9:e uppl.)

Swokowski, Earl William, och Jeffery A. Cole. Precalculus: Functions and Graphs. Thirteenth edition. Cengage, 2019.