Sianipar CS, Sinambela M. Implementasi Model Pembelajaran Problem Based Learning (PBL) pada Materi Tumbuh Kembang Makhluk Hidup di Kelas XI SMA Negeri 17 Medan. CE [Internet]. 2025 Sep. 17 [cited 2025 Sep. 18];6(2):527-41. Available from: https://pusdikra-publishing.com/index.php/josr/article/view/2741