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. DOI: 10.31004/innovative.v1i2.2084. Disponível em: https://journal.universitaspahlawan.ac.id/index.php/Innovative/article/view/2084. Acesso em: 5 dec. 2025.