APA (7th ed.) Citation

Gehrmann, J., & Lester, T. (1984). Trigonometry. Harcourt Brace Jovanovich.

Chicago Style (17th ed.) Citation

Gehrmann, James, and Thomas Lester. Trigonometry. San Diego: Harcourt Brace Jovanovich, 1984.

MLA (9th ed.) Citation

Gehrmann, James, and Thomas Lester. Trigonometry. Harcourt Brace Jovanovich, 1984.