Tampubolon, Grace, Hanna Sianturi, Jelita Sitotus, Yesika Simbolon, Rosdiana Siregar, and Lili Tansliova. 2024. “Using Problem Based Learning (PBL) to Improve Critical Thinking Skills and Indonesian Language Skills”. QISTINA: Jurnal Multidisiplin Indonesia 3 (1):843-47. https://doi.org/10.57235/qistina.v3i1.2440.