Cita APA (7a ed.)
Roethel, L. F. (1965). To improve your grades in trigonometry (1a. ed.). Collier Books.
Cita Chicago Style (17a ed.)
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. New York: Collier Books, 1965.
Cita MLA (9a ed.)
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. Collier Books, 1965.
Precaución: Estas citas no son 100% exactas.