Antonius KAP Simbolon. THE THE EFFECTIVENESS OF THE CREATIVE PROBLEM SOLVING LEARNING MODEL IN TERMS OF STUDENTS’ MATHEMATICAL REASONING AND COMMUNICATION SKILLS. NHJ [Internet]. 2022 Aug. 2 [cited 2025 Aug. 15];2(3):147-56. Available from: https://nusantarahasanajournal.com/index.php/nhj/article/view/421