Astyaningrum, S., & YP, S. (2018). EFEKTIVITAS MODEL PROBLEM BASED LEARNING TERHADAP PENILAIAN KOGNITIF SUBTEMA KESEIMBANGAN EKOSISTEM KELAS V SD. JS (JURNAL SEKOLAH), 2(1), 102–106. https://doi.org/10.24114/js.v2i1.9927