U.Z., L.M. Zulfahrin, Haryono Haryono, and Sri Wardani. “The Development of Chemical E-Module Based on Problem of Learning to Improve The Concept of Student Understanding”. Innovative Journal of Curriculum and Educational Technology 8, no. 2 (July 8, 2019): 59-66. Accessed July 3, 2024. https://journal.unnes.ac.id/sju/ujet/article/view/31340.