Nurhamidah, R., and M. A. Akbar. “USE OF PROBLEM BASED LEARNING MODELS TO IMPROVE STUDENT LEARNING OUTCOMES AT SD NEGERI 1 BUMIRATU”. Journal of Learning on History and Social Sciences, vol. 1, no. 6, June 2024, pp. 69-77, doi:10.61796/ejlhss.v1i6.664.