Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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