Apriana, Wieke, Izka Sofiyya, Madarina Julia, and Emy Huriyati. “Relationship Between Physical Activity and Concentration of Study of Teenagers in Yogyakarta, Indonesia”. Pakistan Journal of Nutrition 15, no. 3 (February 15, 2016): 211–216. Accessed August 26, 2025. https://pjnonline.org/pjn/article/view/2294.