1. Milliken , R. J. W. Kizer A Comparison of Two-and Three-Dimensional NAVSTAR Navigation Solutions Proc IEEE 1978 Nat'l Aerospace and Electronics Conference, NAECON 78, Vol. 1 , as excerpted in AESS Newsletter August 1978 22 31
2. U.S. Navy Hydrographic Office Pub. No. 9, American Practical Navigator , by N. Bowditch 1962
3. U.S. Navy Hydrographic Office Pub. No. 216, Air Navigation 1963
4. U.S. Navy Hydrographic office Pub. No. 220, Navigation Dictionary 1963
5. The International Dictionary of Physics and Electronics