“UPGRADE SISTEM PENGAJUAN CUTI KARYAWAN BERBASIS PLATFORM PHP FRAMEWORK CODEIGNITER PADA KRAKATAU IT”. Jurnal Insan Unggul 14, no. 1 (April 1, 2026): 25–37. Diakses Juli 1, 2026. https://jurnal-iu.sttikom-iu.ac.id/index.php/01/article/view/191.