1. ACI Airport economics survey, 1999. Airports Council International, Geneva
2. ACI, 2000. Quality of service at airports: standards and measurements. Airports Council International, Geneva
3. ACI, 2001. http://www.airports.org/traffic/passengers.html. Accessed 8th April 2001
4. Level of service design concept for airport passenger terminals––a European view;Ashford;Transport Planning and Technology,1988
5. Airport Operations;Ashford,1995