Lumbanraja, Obaja Marum. “Perancangan Sistem Informasi Administrasi Jasa Keamanan Berbasis Web Studi Kasus: PT Pasopati Guardian Security Services”. TeIKa 11, no. 1 (April 29, 2021): 65-86. Diakses April 26, 2024. https://jurnal.unai.edu/index.php/teika/article/view/2480.