APA (7th ed.) Citation

Stitz, C., & Zeager, J. (2011). College Trigonometry. Stitz Zeager Open Source Mathematics.

Chicago Style (17th ed.) Citation

Stitz, Carl, and Jeff Zeager. College Trigonometry. [Place of publication not identified]: Stitz Zeager Open Source Mathematics, 2011.

MLA (9th ed.) Citation

Stitz, Carl, and Jeff Zeager. College Trigonometry. Stitz Zeager Open Source Mathematics, 2011.