Sitompul O, Sitompul P. PENGARUH PEMBELAJARAN BERBASIS PROBLEM BASED LEARNING MELALUI LESSON STUDY TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS XI SMA NEGERI 7 MEDAN. HT [Internet]. 2022Aug.25 [cited 2024Jul.22];1(10):1365-74. Available from: https://journal.ikopin.ac.id/index.php/humantech/article/view/2149