W. E. Bell
Unknown Author
G. D. Gierhart
Evans, W. R.
United States. Congress. House. Committee on Interstate and Foreign Commerce
James G. Dong
Hans Laping
United States Federal Aviation Administration
J. R. Juroshek
United States. Air Coordinating Committee. Technical Division.
United States. Congress. House. Committee on Government Operations.
David H. Williams
International Symposium on the U. S. Domestic Short Distance Navigation System - VORTAC - and Its Relationship to the International Air Navigation System Washington, D. C., and Indianapolis 1958.
María del Carmen Lorenzo Díaz