Erwin, Heather, Alicia Fedewa, and Soyeon Ahn. “Student Academic Performance Outcomes of a Classroom Physical Activity ıntervention: A Pilot Study”. International Electronic Journal of Elementary Education 5, no. 2 (July 27, 2017): 109–124. Accessed October 27, 2021. https://iejee.com/index.php/IEJEE/article/view/15.