Demana, F. D., & Waits, B. K. (1990). Trigonometry, a graphing approach. Addison-Wesley Pub. Co.
Cita Chicago (17th ed.)Demana, Franklin D., i Bert K. Waits. Trigonometry, a Graphing Approach. Reading, Mass: Addison-Wesley Pub. Co, 1990.
Cita MLA (9th ed.)Demana, Franklin D., i Bert K. Waits. Trigonometry, a Graphing Approach. Addison-Wesley Pub. Co, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.