Cita APA (7th ed.)

Drooyan, I., Hadel, W., & Carico, C. C. (1977). Essentials of trigonometry (2d ed.). MacMillan.

Cita Chicago (17th ed.)

Drooyan, Irving, W. Hadel, i C. C. Carico. Essentials of Trigonometry. 2d ed. N. Y: MacMillan, 1977.

Cita MLA (9th ed.)

Drooyan, Irving, et al. Essentials of Trigonometry. 2d ed. MacMillan, 1977.