Akhmad, Teuku Adriansyah, Dimas Apriano, and Edi Abdurachman. 2011. “ANALISIS DAN PERANCANGAN SISTEM E-PROCUREMENT PADA PT. XYZ”. Journal of Business Strategy and Execution 3 (2):176 - 201. https://journal.binus.ac.id/index.php/JBSE/article/view/209.