CHNGU, Pak Kwong. “Curl-Up Test: A New Abdominal Muscular Endurance Test: 仰臥捲腹測試法: 測定腹肌耐力的新方法”. Asian Journal of Physical Education & Recreation 1, no. 2 (December 1, 1995): 16–21. Accessed October 3, 2022. https://ejournals.lib.hkbu.edu.hk/index.php/ajper/article/view/1160.