1. Airbus. (2013). Global market forecast 2013–2032. Retrieved March 3, 2014
http://www.airbus.com/company/market/forecast/
2. Alcock. (2013).
http://www.ainonline.com/aviation-news/ain-air-transport-perspective/2013-10-07/icao-agrees-global-emissions-cap-and-trade-scheme-2020
3. ATAG (Air Transport Action Group). (2012). Aviation: Benefits beyond borders report. Prepared by Oxford Economics for ATAG, Geneva, Switzerland. Retrieved February 14, 2014, from
http://aviationbenefitsbeyondborders.org/download-abbb-report
4. Bauen, A., Howes, J., Bertuccioli, L., & Chudziak, C. (2009). Review of the potential for biofuels in aviation. London: E4tech.
5. Berghof, R., Schmitt, A., Eyers, C., Haag, K., Middel, J., Hepting, M., et al. (2005). CONSAVE 2050—executive summary, competitive and sustainable growth. In Competitive and Sustainable Growth, G4MA-CT-2002-04013. Retrieved June 27, 2008, from
http://www.dlr.de/consave/CONSAVE 202050 20Executive 20Summary.pdf