Choirian, Nurizal, Said Junaidi, and Setya Rahayu. “MANAJEMEN LIFEGUARD PADA WATER BLASTER KOTA SEMARANG”. Journal of Sport Science and Fitness 2, no. 1 (1). Accessed April 28, 2024. https://journal.unnes.ac.id/sju/jssf/article/view/1947.