Wulanndari, I. (2023). Validity of Problem Based Learning (PBL) Worksheets to Improve Learners’ Creative Thinking Skills on Renewable Energy Study Materials. IPF: Inovasi Pendidikan Fisika, 12(3), 57–67. Retrieved from https://ejournal.unesa.ac.id/index.php/inovasi-pendidikan-fisika/article/view/57136