Ayu, Fitri, and Ari Mustofa. “Sistem Aplikasi Absensi Menggunakan Teknologi Barcode Scanner Berbasis Android”. IT Journal Research and Development 4, no. 2 (December 21, 2019). Accessed September 24, 2020. https://journal.uir.ac.id/index.php/ITJRD/article/view/3642.