Sumiatiningsih, and Nur Efendi. 2021. “The Student Problem Solving Skills in Science Subjects Based on Class Rankings : Keterampilan Pemecahan Masalah Siswa Pada Mata Pelajaran IPA Berdasarkan Peringkat Kelas”. Academia Open 5 (August):10.21070/acopen.5.2021.2240. https://doi.org/10.21070/acopen.5.2021.2240.