Syaiputra Wahyuda Meisa Diningrat, Luluk Janah, and Sakinatul Mardiyah. “Modified Bottle Cap for Improving Children’s Arithmetic Ability”. JPUD - Jurnal Pendidikan Usia Dini 13, no. 2 (December 1, 2019): 249–263. Accessed November 22, 2024. https://journal.unj.ac.id/unj/index.php/jpud/article/view/11646.