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