Kindangen, Valentine, Victor Sulangi, and I Damai. 2021. “PENGEMBANGAN PERANGKAT PEMBELAJARAN MODEL PROBLEM SOLVING MATERI BARISAN ARITMATIKA PESERTA DIDIK SMA NEGERI KAKAS”. Sora Journal of Mathematics Education 2 (1), 28-34. https://doi.org/10.30598/sora.2.1.28-34.