United States. Federal Communications Commission. FCC Record, Volume 1, No. 7, Pages 1267 to 1368, December 22, 1986 - January 2, 1987, book, January 1987; (https://digital.library.unt.edu/ark:/67531/metadc1579/m1/51/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .