Widya, Astriza. “Identifikasi Risiko Penerapan E-Ticketing (pada Perum Damri Cabang Lampung)”. Jurnal Kompetitif Bisnis, vol. 1, no. 5, May 2021, p. 7, https://jkb.fisip.unila.ac.id/index.php/jkb/article/view/102.