Roethel, L. F. (1965). To improve your grades in trigonometry (1a. ed.). Collier Books.
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Citación estilo Chicago
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. New York: Collier Books, 1965.
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Cita MLA
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. Collier Books, 1965.
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