1. Bagg D. and Pant, R. S., "Improved Model for Estimation of Terminal Airspace Capacity", Proceedings of ATRS-2006 World Conference of Air Transport Research Society, 26-28, May, 2006, Nagoya, Japan.
2. FAA 2002, "IFR Operations in the National Airspace Systems", Technical Report, 2002, Federal Aviation Administration, USA.
3. FAA 2004, "Aeronautical Information Manual: Official Guide to Basic Information and ATC Procedures", Technical Report, Federal Aviation Administration and US Dept of Transportation, USA.
4. FAA 2005, "Aeronautical Information Publication", Technical Report, 2005, Federal Aviation Administration and US Dept of Transportation, USA.
5. Nolan, M. S., "Fundamentals of Air Traffic Control", Fourth Edition, 2004, Thomson Books Cole, ISBN 0-534-39388-8, 2004, USA.