Albab, Mukhammad Ulil, and Isna Fitria Agustina. “Digital Official Letter Management Using E-Buddy Sidoarjo Application: Pengelolaan Surat Resmi Digital Menggunakan Aplikasi E-Buddy Sidoarjo”. Indonesian Journal of Law and Economics Review 19, no. 4 (October 4, 2024): 10.21070/ijler.v19i4.1188. Accessed December 6, 2025. https://ijler.umsida.ac.id/index.php/ijler/article/view/1188.