1. Altitude Air Pressure Calculator;Baillie,2006
2. Boeing Commercial Airplane, 2011 http://www.boeing.com/commercial/cabinair/26.09.2011.
3. Commercial Airliner Environmental Control System;Hunt,1995
4. Airframe and Systems 2;Lufthansa Flight Training,2001
5. Air Quality Guidelines for Europe;World Health Organisation,2000