Sarkar, A. C. (1970). Higher Trigonometry. Macdonald & Evans.
Cita Chicago (17th ed.)Sarkar, A. C. Higher Trigonometry. London: Macdonald & Evans, 1970.
Cita MLA (9th ed.)Sarkar, A. C. Higher Trigonometry. Macdonald & Evans, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.