Sirait, Hasanuddin, and Harmonvikler d. Lumban Raja. “Incoming And Outgoing Mail Filing Information System Using The View Controller Model At College Institutions”. Jurnal Mantik 5, no. 3 (October 22, 2021): 1625-1635. Accessed April 19, 2026. https://iocscience.org/ejournal/index.php/mantik/article/view/1559.