Tohutoro APA (7th ed.)
Roethel, L. F. (1965). To improve your grades in trigonometry (1a. ed.). Collier Books.
Tohutoru Kātū Chicago (17th ed.)
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. New York: Collier Books, 1965.
Tohutoro MLA (9th ed.)
Roethel, Louis F. To Improve Your Grades in Trigonometry. 1a. ed. Collier Books, 1965.
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