Savitri GAMHD. Enhancing Operational Performance Index Using the Theory of Constraints: A Case Study at PT XYZ. j.emerging.bus.man.entre.stud [Internet]. 2025May28 [cited 2025Jul.16];5(1):34-49. Available from: https://jebmes.ppmschool.ac.id/index.php/jebmes/article/view/183