ALDI SINAI FERDIANTO SIMBOLON; ERNA SULISTYOWATI. Sistem Purchase Order terhadap Efisiensi dan Pengendalian Pengadaan Barang Operasional : Studi Kasus pada DoubleTree by Hilton Surabaya. JURNAL EKONOMI BISNIS DAN MANAJEMEN, [S. l.], v. 4, n. 3, p. 435–448, 2026. DOI: 10.59024/jise.v4i3.2123. Disponível em: https://jurnal.alimspublishing.co.id/index.php/JISE/article/view/2123. Acesso em: 16 jul. 2026.