NILES, N. 0. (1959). Plane trigonometry. Wiley.
Tohutoru Kātū Chicago (17th ed.)NILES, Nathan 0. Plane Trigonometry. New York: Wiley, 1959.
Tohutoro MLA (9th ed.)NILES, Nathan 0. Plane Trigonometry. Wiley, 1959.
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