“Travel and Tours Management System – Core 2 Transaction (Account Executive, Passport and Visa Processing, Flights Schedule and Rates, Customer Relationship Management)”. 2019. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research 1 (1). https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/2168.