Refika Ayuna Sari (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), pp. 198–203. Available at: https://journalwbl.com/index.php/mjsis/article/view/579 (Accessed: 8 June 2026).