Cita APA (7th ed.)
Hirsch, C. R., & Schoen, H. L. (1985). Trigonometry and its applications. McGraw-Hill.
Cita Chicago (17th ed.)
Hirsch, Christian R., i Harold L. Schoen. Trigonometry and Its Applications. New York: McGraw-Hill, 1985.
Cita MLA (9th ed.)
Hirsch, Christian R., i Harold L. Schoen. Trigonometry and Its Applications. McGraw-Hill, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.