United States. Federal Communications Commission. FCC Record, Volume 5, No. 17, Pages 5138 to 5328, August 13 - August 24, 1990, book, August 1990; (https://digital.library.unt.edu/ark:/67531/metadc1655/m1/1/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .