Dorlan Naibaho, Epa Gracelia Ferals Sitorus. Pentingnya Guru dalam Menguasai Substansi Materi Pembelajaran. JURDIKBUD [Internet]. 2023 Nov. 29 [cited 2024 May 17];3(3):166-71. Available from: https://journal.amikveteran.ac.id/index.php/jurdikbud/article/view/2635