Petri, Oki, and Suryelita Suryelita. “The Development of Student Worksheets Based Problem Based Learning on Amine Topics for 3rd Grade of Senior High School”. Entalpi Pendidikan Kimia 3, no. 3 (July 22, 2022): 27-35. Accessed October 6, 2024. http://entalpipendidikan.ppj.unp.ac.id/index.php/epk/article/view/274.