Kurnia, Hasbi, Geovanne Farell, Denny Kurniadi, and Rizkayeni Marta. “A Dual-Validation Mobile Attendance Application for Discipline-Oriented Vocational Schools: Development and Evaluation Using the Waterfall”. Journal of Hypermedia & Technology-Enhanced Learning 3, no. 3 (October 16, 2025): 283–295. Accessed January 22, 2026. https://edutech-journals.org/index.php/j-hytel/article/view/200.