Setyadi, I. M. A., Sudiarta, I. G. P., & Mertasari, N. M. S. (2020). The effect of predict-observe-explain (POE) learning model using open-ended problem (OEP) towards students’ mathematical problem solving skill. Jurnal Pendidikan Dan Pengajaran, 52(3), 133–144. https://doi.org/10.23887/jpp.v52i3.15713