United States. Federal Communications Commission. FCC Record, Volume 26, No. 7, Pages 4843 to 5761, March 28 - April 08, 2011, book, April 2011; (https://digital.library.unt.edu/ark:/67531/metadc52169/m1/84/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .