Celestial, G. S., et al. “Airport Management System: Logistic 1 (Maintenance Repair and Overhaul, Asset Management, Warehousing, Procurement)”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 1, no. 1, Apr. 2019, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/2223.