Anggun Fergina, M.Kom, Kamdan, M.Kom, and Berniman Gofindo Malau. 2023. “Analysis and Design of an Android-Based Tourism E-Ticket Application System in The Toba Caldera With a CRM Approach”. Jurnal Info Sains : Informatika Dan Sains 13 (03):932-40. https://ejournal.seaninstitute.or.id/index.php/InfoSains/article/view/3535.