Risyanti, Elis, Lisdiana Lisdiana, and Wiwi Isnaeni. “Implementation of Supplement Teaching Materials Based on Problem Based Learning to Improve Concept Mastery and Health Care Attitudes”. Journal of Primary Education 11, no. 2 (June 30, 2022): 218-230. Accessed June 21, 2024. https://journal.unnes.ac.id/sju/jpe/article/view/52345.