United States. Federal Communications Commission. FCC Record, Volume 28, No. 18, Pages 14515 to 15396, October 21 - November 1, 2013, book, November 2013; (https://digital.library.unt.edu/ark:/67531/metadc282355/m1/1/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .