Aini, I.F.N., Nuraini, N.L.S. and Yuniawatika, Y. 2023. Development of pop-up book media based on project-based learning in mathematics learning about flat shapes in elementary schools. JINoP (Jurnal Inovasi Pembelajaran). 9, 2 (Nov. 2023), 259–276. DOI:https://doi.org/10.22219/jinop.v9i2.28299.