Nugroho, Feri, Susi Maulidiah, Indra Satriadi, Aisah Rini Susanti, Desta Ria Erika, Maivi Kusnandar, dan Yulia Hapsari. “The Use of Gamification in E-Learning to Enhance TOEIC Learning Motivation”. Jurnal Sistem Informasi (JASISFO) 6, no. 2 (September 29, 2025). Diakses November 12, 2026. https://jurnal.polsri.ac.id/index.php/jasisfo/article/view/11095.