APA (7th ed.) Citation

Droyan, I., Hadel, W., & Carico, C. (1977). Essentials of trigonometry (2a ed.). Macmillan Distribution Limited.

Chicago Style (17th ed.) Citation

Droyan, Irving, Walter Hadel, and Ch Carico. Essentials of Trigonometry. 2a ed. New York: Macmillan Distribution Limited, 1977.

MLA (9th ed.) Citation

Droyan, Irving, et al. Essentials of Trigonometry. 2a ed. Macmillan Distribution Limited, 1977.