Erni L. Efforts to increase agility and speed physical education lessons in playing football using student demonstration methods class v Sd negeri 14 perawang barat. JIPS [Internet]. 2018 Feb. 7 [cited 2024 Dec. 22];2(1):187-95. Available from: https://e-journal.sastra-unes.com/index.php/JIPS/article/view/323