Ridho Bramulya Ikhsan, Johannes Widjaja Wahono , Rudy Kodirun. “CUSTOMER LOYALTY TO PREPAID CARD: THE SURVEY ON STUDENT AS IM3 USERS IN LAMPUNG, INDONESIA”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 18, no. 1, Dec. 2020, pp. 553 -67, https://www.archives.palarch.nl/index.php/jae/article/view/2069.