Hartono H, Darmawan RE, Listyowati D. Influence Combination Exercise William Flexion and Mckenzie Extension to Scale Painful Back Lower on Farmer. BANRJ [Internet]. 2022Dec.15 [cited 2026Jun.17];3(2):46-50. Available from: https://banrj.futuresciencejournal.org/index.php/banrj/article/view/45