Khamtha, Ratree, and Kanang Srihirun. 2020. “EFFECTS OF STABLE AND UNSTABLE LOAD ON STABLE AND UNSTABLE SURFACE ON EMG ACTIVITY DURING BACK SQUAT EXERCISE IN COLLEGE STUDENTS”. Journal of Sports Science and Health 21 (3). Bangkok, Thailand:342-55. https://he02.tci-thaijo.org/index.php/spsc_journal/article/view/248385.