Barokati Seliro Wangi, N.; Setyosari, P.; Kuswandi, D.; D Dwiyogo, W. Gamification As a Strategy to Improve Student Learning Motivation : Preparing Student for 21st Century. IJET 2018, 7 (2.14), 323-325. https://doi.org/10.14419/ijet.v7i2.12.14699.