1. Aviation Week and Space Technology 79 February 22, 1982
2. Panel Discussion on Satellite Navigation Issues, Proceedings of the ION National Marine Meeting, New Orleans, Louisiana 1820 November, 1980
3. Federal Radionavigation Plan, Published by the Department of Defense and the Department of Transportation July 1980
4. Beser , J. Parkinson , B. W. The Application of NAVSTAR Differential GPS in the Civilian Community Proceedings of the thirty-seventh Annual Meeting of the Institute of Navigation, Annapolis, Maryland June 911, 1981
5. The Many Faces of TRANSIT;Stansell;Navigation,Spring 1978