Ernawati Y, Marianti A, Saptono S. The Improvement of Student’s Critical Thinking Skills on Motion System Material through the Use of Digital Book based on Problem Based Learning. JISE [Internet]. 6Aug.2022 [cited 21Dec.2024];11(2):137-41. Available from: https://journal.unnes.ac.id/sju/jise/article/view/45185