Farouk Abdelnabi Hassanein Attaalla. (2017). AMADEUS, SABRE, AND GALILEO AS PIONEER BOOKING SYSTEMS: A CRITICAL EVALUATION IN LIGHT OF TRAINING AND FIELD EXPERIENCE IN THE MIDDLE EAST 2011-2017. International Journal on Recent Trends in Business and Tourism (IJRTBT), 1(3), 21-28. Retrieved from https://ejournal.lucp.net/index.php/ijrtbt/article/view/265