APRILIA, Widia; APREASTA, Lika; PRASETYO, Dian Estu. Pengembangan Buku Ajar Berbasis Model Problem Based Learning pada Subtema 1 Kekayaan Sumber Energi Di Indonesia pada kelas IV Sekolah Dasar. Innovative: Journal Of Social Science Research, [S. l.], v. 1, n. 2, p. 48–54, 2021. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/14. Acesso em: 31 may. 2026.