Musfirah, et al. “Implementation the Problem Based Learning (PBL) Model Assisted by Pop-Up Book Media to Increase the Activeness of Science Learning in Class V Students of UPTD SD Negeri 85 Parepare”. International Journal of Sustainable Applied Sciences, vol. 4, no. 7, July 2026, pp. 585-96, doi:10.59890/ijsas.v4i7.16.