SITANGGANG, Andri Kristianto; LUBIS, Asrin; ELISA, Tetty Suyanty. PENGEMBANGAN MODEL DESIGN DIDACTIC RESEARCH (DDR) UNTUK MENGATASI HAMBATAN BELAJAR (LEARNING OBSTACLE) MATEMATIKA. JURNAL HANDAYANI PGSD FIP UNIMED, [S. l.], v. 15, n. 1, p. 1–6, 2024. DOI: 10.24114/jh.v15i1.60118. Disponível em: http://103.242.233.34/index.php/handayani/article/view/60118. Acesso em: 31 jan. 2025.