Refika Ayuna Sari, Ervan Yudi Widyarto, Arif Hidayat Husni, Lanny Catrin Dale, Roni, and , Lexy Majesty Pendong. 2026. “Analysis of the Effectiveness of the MailMaster Application in Improving the Management of Letter Numbering”. Multidisciplary Journal of Systemic and Innovative Research 3 (1):198-203. https://journalwbl.com/index.php/mjsis/article/view/579.