Refika Ayuna Sari, Ervan Yudi Widyarto, Arif Hidayat Husni, Lanny Catrin Dale, Roni, and , Lexy Majesty Pendong, “Analysis of the Effectiveness of the MailMaster Application in Improving the Management of Letter Numbering”, MJSIS, vol. 3, no. 1, pp. 198–203, Mar. 2026.