HUSSAIN, Akbar Ali; AKHTER, Shamim; QURESHI, Abrar Hussain; KHAN, Komal. Problem-Based Learning Approach for Elementary Schools: A case study of five Years Compulsory Education system. Innovation Journal of Social Sciences and Economic Review, London, U.K., v. 3, n. 2, p. 11–17, 2021. DOI: 10.36923/ijsser.v3i2.69. Disponível em: https://www.ijsser.com/index.php/ijsser/article/view/69. Acesso em: 4 mar. 2026.