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 (Jul. 2017), 21-28.