Darajat, Zakiyah, Suciati Suciati, and Amalia Sapriati. 2023. “The Use of Problem Based Learning Learning Models to Improve Critical Thinking Skills and Engagement and Student Learning Outcomes”. Edumaspul: Jurnal Pendidikan 7 (1). https://jurnal.unimen.cloud/index.php/maspuljr/article/view/5524.