Suyanti. “Improving Learning Outcomes Theme VII Sub Theme 1 Using the Problem-Based Learning Model for Fifth Grade Students at SD Negeri 2 Samigaluh, Kulon Progo Regency, Academic Year 2021/2022”. IJCER (International Journal of Chemistry Education Research), vol. 7, no. 2, Oct. 2023, pp. 89-92, doi:10.20885/ijcer.vol7.iss2.art9.