JUMIATI, J.; MUFLIHAH, M.; NURLAILI, N. Model numbered head together dan round robin: Studi perbedaan hasil belajar siswa pada pokok bahasan sistem periodik unsur . Bivalen: Chemical Studies Journal, [S. l.], v. 2, n. 1, p. 16–19, 2019. DOI: 10.30872/bcsj.v2i1.296. Disponível em: https://jurnal.fkip.unmul.ac.id/index.php/bivalen/article/view/296. Acesso em: 5 dec. 2025.