Tommy Kuncara, Arman Syah Putra, Nurul Aisyah, and VH. Valentino. “Effectiveness of the E-Ticket System Using QR Codes For Smart Transportation Systems”. International Journal of Science, Technology & Management 2, no. 3 (May 26, 2021): 900–907. Accessed January 22, 2026. https://ijstm.inarah.co.id/index.php/ijstm/article/view/236.