APA (7th ed.) Citation

Curtiss, D. R., & Moulton, E. J. (1942). Essentials of trigonometry: With applications. Heath.

Chicago Style (17th ed.) Citation

Curtiss, David Raymond, and Elton James Moulton. Essentials of Trigonometry: With Applications. Boston: Heath, 1942.

MLA (9th ed.) Citation

Curtiss, David Raymond, and Elton James Moulton. Essentials of Trigonometry: With Applications. Heath, 1942.