Permana, Erwin Putera, and Yeny Endah Purnama Sari. “Development of Pop Up Book Media Material Distinguishing Characteristics of Healthy and Unfit Environments Class III Students Elementary School”. International Journal of Elementary Education 2, no. 1 (April 30, 2018). Accessed May 6, 2024. https://ejournal.undiksha.ac.id/index.php/IJEE/article/view/13127.