Cita APA (7th ed.)
Beckenbach, E. F., & Drooyan, I. (1972). Modern college algebra and trigonometry (2d ed.). Wadsworth Pub. Co..
Cita Chicago (17th ed.)
Beckenbach, Edwin F., i Irving Drooyan. Modern College Algebra and Trigonometry. 2d ed. Belmont, Calif.: Wadsworth Pub. Co., 1972.
Cita MLA (9th ed.)
Beckenbach, Edwin F., i Irving Drooyan. Modern College Algebra and Trigonometry. 2d ed. Wadsworth Pub. Co., 1972.
Atenció: Aquestes cites poden no estar 100% correctes.