Safithri, Resdiana, Syaiful Syaiful, and Nizlel Huda. “Pengaruh Penerapan Problem Based Learning (PBL) Dan Project Based Learning (PjBL) Terhadap Kemampuan Pemecahan Masalah Berdasarkan Self Efficacy Siswa”. Jurnal Cendekia : Jurnal Pendidikan Matematika 5, no. 1 (March 6, 2021): 335-346. Accessed August 20, 2022. https://j-cup.org/index.php/cendekia/article/view/539.