Lia, A. ., Gunawan, Kusuma, J. W. . and Herawati, R. A. . (2024) “IMPROVEMENT OF STUDENT LEARNING ACTIVITY AND LEARNING ACHIEVEMENT USING THE PROBLEM-BASED LEARNING MODEL”, International Journal of Multidisciplinary Research and Literature, 3(4), pp. 428–435. doi: 10.53067/ijomral.v3i4.240.