Ho I, Clarence I, Bedoya Y, Arjona M. USED OF SAP R/3 ELECTRONIC INVOICING APPLICATIONS UNDER WATERFALL TRADITIONAL METHODOLOGY. FAECO sapiens [Internet]. 2020 Dec. 30 [cited 2024 Aug. 18];4(1):43-58. Available from: https://revistas.up.ac.pa/index.php/faeco_sapiens/article/view/1881