Dyfyniad APA

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

Dyfyniad Arddull Chicago

Drooyan, Irving, Walter Hadel, and Charles C. Carico. Essentials of Trigonometry. 2d ed. New York: Macmillan, 1977.

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.