ILWANDRI, Ilwandri. Pengembangan Instrumen Validasi Buku Model Connected - Problem Based Learning (CPBL) Untuk Meningkatkan Keterampilan Abad-21 Siswa. Innovative: Journal Of Social Science Research, [S. l.], v. 3, n. 5, p. 9542–9548, 2023. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/5640. Acesso em: 4 jun. 2026.