Lanos, M. E. C., A. Ulfa, A. Damanik, S. Sulurudin, and P. Jauhari. “Efforts to Improve Discuss Throwing Skills With Water Pipe Modifications in Junior High School Students”. Edumaspul: Jurnal Pendidikan, Vol. 7, no. 1, Mar. 2023, pp. 707-15, https://ummaspul.e-journal.id/maspuljr/article/view/5604.