APA (7th ed.) Citation

Drooyan, I. (1967). Trigonometry: An analytic approach. The Macmillan.

Chicago Style (17th ed.) Citation

Drooyan, Irving. Trigonometry: An Analytic Approach. New York: The Macmillan, 1967.

MLA (9th ed.) Citation

Drooyan, Irving. Trigonometry: An Analytic Approach. The Macmillan, 1967.

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