rahayu, indah, and eric dwi putra. “Proses Berpikir Penyelesaian Proyek Bertingkat Medode Flipped Classroom Di Masa Pandemi COVID-19”. Jurnal Axioma : Jurnal Matematika dan Pembelajaran 6, no. 2 (March 22, 2022): 128–138. Accessed June 25, 2022. http://ejurnal.uij.ac.id/index.php/AXI/article/view/1209.