Aprilia W, Apreasta L, Prasetyo DE. Pengembangan Buku Ajar Berbasis Model Problem Based Learning pada Subtema 1 Kekayaan Sumber Energi Di Indonesia pada kelas IV Sekolah Dasar. Innovative [Internet]. 2021 Oct. 25 [cited 2025 Dec. 5];1(2):48-54. Available from: https://journal.universitaspahlawan.ac.id/index.php/Innovative/article/view/2084