United States. Federal Communications Commission. FCC Record, Volume 19, No. 6, Pages 4326 to 5230, March 10 - March 19, 2004, book, March 2004; (https://digital.library.unt.edu/ark:/67531/metadc4079/m1/726/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .