Yuniawati TL, Purba FJ. Discovery learning model to optimize students™ critical thinking skills on hydrocarbon material. J.Pendidik.Kim [Internet]. 2021 Dec. 8 [cited 2025 Jul. 2];13(3):269-77. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/30208