Defliyanto, Sugiyanto, and Panji Alfian, “The Effect of Snand Bottle Load Exercise on the Ability of Badminton Backhand Service of Extracurricular Students of SMP Negeri 63 Bengkulu Utara”, J. Ilm. Pendidik. Jasm, vol. 5, no. 4, pp. 869–875, Dec. 2021.