Kurniawati, Naning. “PENINGKATAN DAYA RETENSI SISWA MELALUI LESSON STUDY DENGAN PBL (PROBLEM BASED LEARNING) PADA MATERI LINGKARAN”. Journal of Mathematics Education and Science 1, no. 1 (April 15, 2018): 35–41. Accessed May 6, 2024. https://journal.unugiri.ac.id/index.php/JaMES/article/view/15.