SITANGGANG, ANDRI KRISTIANTO. MENINGKATKAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA SD MELALUI PENDEKATAN OPEN-ENDED. JURNAL HANDAYANI PGSD FIP UNIMED, [S. l.], v. 2, n. 2, 2015. DOI: 10.24114/jh.v2i2.2029. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/handayani/article/view/2029. Acesso em: 5 jul. 2025.