AMINI, M.; HELMANTO, F.; HIDAYAT, A. Number lines in learning mathematic integer at the upper level. ETUDE: Journal of Educational Research, [S. l.], v. 1, n. 1, p. 19–25, 2020. DOI: 10.56724/etude.v1i1.37. Disponível em: https://alejournal.com/index.php/etude/article/view/37. Acesso em: 3 apr. 2025.