Ryan, James A. (January 1996). "Leibniz' Binary System and Shao Yong's "Yijing"". Philosophy East and West. 46 (1): 59–90. doi:10.2307/1399337. JSTOR1399337.
Ryan, James A. (January 1996). "Leibniz' Binary System and Shao Yong's "Yijing"". Philosophy East and West. 46 (1): 59–90. doi:10.2307/1399337. JSTOR1399337.