Khanina, Naila, Fatih Hazar, Enarnimas Damayanti, and Sani Bayu. “The Effect of Ladder Drill Training on Speed and Agility Improvement in Junior Badminton Athletes Aged 11-14 Years”. Journal of Racket Sports Performance & Science (JRSPS) 1, no. 1 (November 27, 2025): 8–15. Accessed December 5, 2025. https://journal.unesa.ac.id/index.php/jrsps/article/view/47216.