Mikami 1913, p. 77 Mikami, Yoshio (1913). "Chapter 11. Ch'in Chiu-Shao". The Development of Mathematics in China and Japan (1st ed.). Chelsea Publishing Co reprint. pp. 74–77.
Directly available online via the link, but also reprinted with appraisal in D.E. Smith: A Source Book in Mathematics, McGraw-Hill, 1929; Dover reprint, 2 vols, 1959.
Berggren 1990, pp. 304–309. Berggren, J. L. (1990). "Innovation and Tradition in Sharaf al-Din al-Tusi's Muadalat". Journal of the American Oriental Society. 110 (2): 304–309. doi:10.2307/604533. JSTOR604533.
Directly available online via the link, but also reprinted with appraisal in D.E. Smith: A Source Book in Mathematics, McGraw-Hill, 1929; Dover reprint, 2 vols, 1959.
Berggren 1990, pp. 304–309. Berggren, J. L. (1990). "Innovation and Tradition in Sharaf al-Din al-Tusi's Muadalat". Journal of the American Oriental Society. 110 (2): 304–309. doi:10.2307/604533. JSTOR604533.
Directly available online via the link, but also reprinted with appraisal in D.E. Smith: A Source Book in Mathematics, McGraw-Hill, 1929; Dover reprint, 2 vols, 1959.