Taufan, M., dan L. Nurafifah. “Appy Pie Integrated Mobile Learning: Design and Feasibility to Help the 3D Geometry Learning Process in the Time of Covid 19 Pandemic”. Math Didactic: Jurnal Pendidikan Matematika, Vol. 7, no. 2, September 2021, hlm. 124-32, doi:10.33654/math.v7i2.1329.