Tham khảo Hàm_lượng_giác

    (bằng tiếng Anh)

    • Carl B. Boyer, A History of Mathematics, 2nd ed. (Wiley, New York, 1991).
    • Eli Maor, Trigonometric Delights (Princeton Univ. Press, 1998).
    • "Trigonometric functions", MacTutor History of Mathematics Archive.
    • Tristan Needham, Visual Complex Analysis, (Oxford University Press, 2000), ISBN 0198534469 Book website
    • Vitit Kantabutra, "On hardware for computing exponential and trigonometric functions," IEEE Trans. Computers 45 (3), 328-339 (1996).