Rama Ubaidillah Syahputra, et al. “Implementasi Program Latihan Ladder Drill Untuk Meningkatkan Kelincahan Dan Kecepatan Pada Atlet Sekolah Bola Voli Bank Jatim: Implementation of a Ladder Drill Training Program to Improve Agility and Speed ​​in Bank Jatim Volleyball Academy Athletes”. Indonesian Strength Conditioning and Coaching Journal, vol. 4, no. 1, July 2026, pp. 165-73, https://ejournal.unesa.ac.id/index.php/isco/article/view/81971.