Maya Putri. (2021). Penerapan Model Problem Based Learning (PBL) Untuk Meningkatkan Hasil Belajar Siswa pada Materi Permintaan dan Penawaran. Jurnal Kinerja Kependidikan (JKK): Facilities of Educator Career and Educational Scientific Information, 2(2), 251–264. Retrieved from https://journalserambi.org/index.php/jkk/article/view/41