SUDIRMAN; DEDY JULIANDRI PANJAITAN. Development of Problem-Based Learning Devices to Improve Mathematics Problem Solving Ability and Learning Independence of Labuhanbatu Private Junior High School Students. International Journal of Educational Research Excellence (IJERE), [S. l.], v. 2, n. 2, p. 384–389, 2023. DOI: 10.55299/ijere.v2i2.553. Disponível em: https://ejournal.ipinternasional.com/index.php/ijere/article/view/553. Acesso em: 3 jul. 2024.