United States. Federal Communications Commission. FCC Record, Volume 28, No. 16, Pages 12584 to 13565, August 22 - September 18, 2013, book, September 2013; (https://digital.library.unt.edu/ark:/67531/metadc272134/m1/1/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .