Landong A, Ayuningsih D, Dita I. Development of fourth grade math teaching materials using the PBL model on student learning outcomes. Cendikia [Internet]. 2023Jul.31 [cited 2026Sep.26];13(6):943-5. Available from: http://ejournal.iocscience.org/index.php/Cendikia/article/view/3824