Chatterji, P. (1988). Trigonometry. Rajhans.
Tohutoru Kātū Chicago (17th ed.)Chatterji, P.N. Trigonometry. Meerut: Rajhans, 1988.
Tohutoro MLA (9th ed.)Chatterji, P.N. Trigonometry. Rajhans, 1988.
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