Rahayu, Sri, Euis Siti Nur Aisyah, and Makrothymia Hia. 2016. “Penerapan Purchase Order Pembelian Barang Secara Internal Berbasis Web Online”. Jurnal Eksplora Informatika 2 (2), 193-202. https://eksplora.stikom-bali.ac.id/index.php/eksplora/article/view/35.