Chhang, M. T., and M. Z. A. Forhad. “A Comparative Study of Students’ Perceptions Toward Physical Education Course and Their Actual Behaviors Toward Physical Activities in Grades 10 and 11 in a Public High School at Phnom Penh, Cambodia”. Scholar: Human Sciences, vol. 12, no. 2, Apr. 2021, pp. 111-26, http://www.assumptionjournal.au.edu/index.php/Scholar/article/view/3984.