Sukwong, T., Sriramatr, S., & Chankuna, D. (2021). Factors affecting Exercise Behavior and Fat Mass to Fat-Free Mass Ratio of the Personal Trainers. Journal of Behavioral Science for Development, 13(1), 61–79. Retrieved from https://so02.tci-thaijo.org/index.php/JBSD/article/view/242781