APA (7th ed.) Citation

Drooyan, I. (1986). Essentials of trigonometry. Macmillan Publishing Co.

Chicago Style (17th ed.) Citation

Drooyan, Irving. Essentials of Trigonometry. New York: Macmillan Publishing Co, 1986.

MLA (9th ed.) Citation

Drooyan, Irving. Essentials of Trigonometry. Macmillan Publishing Co, 1986.

Warning: These citations may not always be 100% accurate.