1. Albert Helfrick, “Principles of Avionics”, 6th ed, Avionics Communications Inc. Leesburg, VA 20175 USA, 2010.
2. Myron Kayton, Walter R. Fried, “Avionics Navigation Systems” 2nd ed, John Wiley & Sons, Inc., U.K., 2010.
3. Pier Domenico Tromboni, Giovanni B. Palmerini, “Navigation Aids Performance Evaluation for Precision Approaches”, International Journal of Aerospace Engineering, 2010.
4. Ch Mahesh, Dr. K Ravindra, Prof. V Kamakshiprasad, “A Frame Work for the Integrity Analysis of Instrument Landing System”, International Journal of Emerging Technology and Advanced Engineering, Volume 2, Issue 7, July 2012.
5. “Obstruction Criteria Beyond ILS Critical and Sensitive Areas-Amendment to Guidance Material in ANNEX 10”, International Civil Aviation Organization (CNS/MET SG/16), Agenda Item 5 : Navigation, July 2012.