Nafkha, Syahadatun, et al. “Increasing Awareness of Saving Early Through the Use of Used Bottles As Educational Piggy Banks at SD Negeri 01 Pringrejo”. Urecol Journal. Part A: Education and Training, vol. 5, no. 2, Dec. 2025, https://e-journal.urecol.org/index.php/ujet/article/view/275.