APA (7th ed.) Citation

Pignani, T. J., & Haggard, P. W. (1968). Elements of trigonometry. Harcourt, Brace r Worl.

Chicago Style (17th ed.) Citation

Pignani, Tullie J., and Paul W. Haggard. Elements of Trigonometry. Harcourt, Brace r Worl, 1968.

MLA (8th ed.) Citation

Pignani, Tullie J., and Paul W. Haggard. Elements of Trigonometry. Harcourt, Brace r Worl, 1968.

Warning: These citations may not always be 100% accurate.