Rohmad, A. “Overview of the Physical Activity of Students Aged 12-16 Years”. Prosiding Seminar Nasional Pendidikan Jasmani Dan Kesehatan, Vol. 1, no. 1, Nov. 2021, pp. 1-7, http://ejournal.fkip.unsri.ac.id/index.php/semnaspenjas/article/view/101.