Ariyasajsiskul, S. ., and K. . Arunchote. “The Effect of Pneumatic Resistance Weight Training on 50-Meter Crawl Swimming Speed”. Academic Journal of Thailand National Sports University, vol. 10, no. 2, May 2018, pp. 203-20, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/248637.