S. Widodo, P. Rahayu, N. Adjie, S. Adi Widodo, and B. Rahmat Setiadi, “The Development of Arithmetic Gamification Using Digital Dice”, IJET, vol. 7, no. 3.2, pp. 751–755, Jun. 2018, doi: 10.14419/ijet.v7i3.2.18742.