NASUTION, Rosni Wardani. MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA MELALUI METODE PROBLEM BASED INSTRUCTION DI KELAS VI SD NEGERI NO. 020 BONANDOLOK. JURNAL HANDAYANI PGSD FIP UNIMED, [S. l.], v. 6, n. 1, 2016. DOI: 10.24114/jh.v6i1.5045. Disponível em: http://103.242.233.34/index.php/handayani/article/view/5045. Acesso em: 31 jan. 2025.