United States. Federal Communications Commission. FCC Record, Volume 8, No. 19, Pages 6621 to 6998, September 6 - September 17, 1993, book, September 1993; (https://digital.library.unt.edu/ark:/67531/metadc1865/m1/136/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .