D. Banjarnahor, E. Darwiyanto, and D. D. J. S. Suwawi, “Analisis Kualitas Sistem Presensi Pada I-Gracias Universitas,” vol. 5, no. 3, pp. 7428–7440, 2018, [Online]. Available: https://openlibrarypublications.telkomuniversity.ac.id/index.php/engineering/article/view/7068/6962