Fornramdee, J., K. Srungboonmee, P. Kaimook, and K. Panich. “CHRONIC EFFECT OF PROPRIOCEPTIVE NEUROMUSCULAR FACILITATION STRETCHING ON FLEXIBILITY AND STRENGTH”. Journal of Sports Science and Technology, vol. 18, no. 2, Dec. 2018, pp. 9-20, https://he01.tci-thaijo.org/index.php/JSST/article/view/125591.