Harahap, I. H. (2017) “DIFFERENCES IN MATHEMATICAL PROBLEM SOLVING ABILITIES AND LEARNING MOTIVATION WITH PROBLEM-BASED LEARNING”, REKOGNISI : Jurnal Pendidikan dan Kependidikan (E-ISSN 2599-2260), 2(2), pp. 21–36. Available at: https://jurnal.unusu.ac.id/index.php/rekognisi/article/view/67 (Accessed: 7 April 2025).