Chatterji, P. N. Trigonometry. Rajhans Prakashan Mandir.
Cita Chicago (17th ed.)Chatterji, P. N. Trigonometry. Meerut: Rajhans Prakashan Mandir.
Cita MLA (9th ed.)Chatterji, P. N. Trigonometry. Rajhans Prakashan Mandir.
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