1.
J. Simamora S, E. Simamora R, Sinaga B. Application of Problem Based Learning to Increase Students’ Problem Solving Ability on Geometry in Class X SMA Negeri 1 Pagaran. IJSBAR [Internet]. 2017 Oct. 1 [cited 2025 Sep. 19];36(2):234-51. Available from: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/8100