Arif Fradina, Rizkyana, Edy Cahyono, and Woro Sumarni. “Development of Natural and Social Science Learning Programme (IPAS) in Elementary School With Understanding by Design (UbD) Framework to Improve Concept Mastery and Problem-Solving Ability”. Journal of Primary Education 11, no. 3 (September 30, 2022): 399-407. Accessed July 18, 2024. http://journal.unnes.ac.id/sju/jpe/article/view/77327.