HARISANDI, A.; KUSUMAWARDANI, R.; MUFLIHAH. Pengaruh model pembelajaran Co-op Co-op terhadap hasil belajar siswa SMK pada materi sistem periodik unsur . Bivalen: Chemical Studies Journal, [S. l.], v. 3, n. 1, p. 1–3, 2020. DOI: 10.30872/bcsj.v3i1.320. Disponível em: https://jurnal.fkip.unmul.ac.id/index.php/bivalen/article/view/320. Acesso em: 5 dec. 2025.