Cita APA (7th ed.)
Willerding, M. F., & Hoffman, S. P. (1971). College algebra and trigonometry. Wiley.
Cita Chicago (17th ed.)
Willerding, Margaret F., i Stephen P. Hoffman. College Algebra and Trigonometry. New York: Wiley, 1971.
Cita MLA (9th ed.)
Willerding, Margaret F., i Stephen P. Hoffman. College Algebra and Trigonometry. Wiley, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.