LAI, Su Lin, and Jung Chi SU. “The Influence on Tennis Serve Performance Between the Groups of National Players and Non-National Players in Terms of with/without Audiences and with/Without Receivers: 有無觀衆在場與有無人接發球對國手與非國手發球表現的影響”. Asian Journal of Physical Education & Recreation 9, no. 1 (June 1, 2003): 44–49. Accessed May 8, 2024. https://ejournals.lib.hkbu.edu.hk/index.php/ajper/article/view/1140.