D. Tri Wahyuningtyas, N. Yuniasih, E. Bambang Irawan, and S. ., “Two-Dimensional Figure E-Modul with Contextual Teaching and Learning (CTL) Approach”, IJET, vol. 7, no. 3.4, pp. 276–278, Jun. 2018, doi: 10.14419/ijet.v7i3.4.19873.