Aqil, D.I. et al. 2021. Problem Based Learning (PBL) in Shaping the Character of Students’ Hard Work and Discipline Through Classification of Creatures: Pembelajaran Problem Based Learning (PBL) dalam Membentuk Karakter Kerja Keras dan Disiplin Siswa Melalui Materi Klasifikasi Mahluk Hidup. Pedagogia : Jurnal Pendidikan. 11, 1 (Nov. 2021), 53–63. DOI:https://doi.org/10.21070/pedagogia.v11i1.762.