Yenni Khairani Pane, Nathanael Sitanggang, Joharis Lubis. Implementation Of Problem-Based Management Model On Improving School Quality Culture At Mts Nurul Iman Tanjung Morawa. IJERSC [Internet]. 2021Dec.19 [cited 2024Nov.7];2(6):1549-52. Available from: https://ijersc.org/index.php/go/article/view/218