LI, E. jing ., M. H. sum LAM, L. LOUIE, and S. S. sum LI. “An Analysis on History and Cultural Background of Chinese Tai Chi Soft Ball: 太極柔力球運動的歷史文化分析”. Asian Journal of Physical Education &Amp; Recreation, vol. 18, no. 1, June 2012, pp. 27-30, doi:10.24112/ajper.181856.