Kurniawan A, Kuncoro M, Setiawan A. Development of Football Materials for Middle School PJOK Teachers Using the ISpring Application. jp.jok [Internet]. 31May2023 [cited 5May2024];6(2):292-08. Available from: http://ejurnal.budiutomomalang.ac.id/index.php/jpjok/article/view/2364