United States. Federal Communications Commission. FCC Record, Volume 30, No. 5, Pages 3494 to 4441, April 13, 2015 - April 30, 2015, book, April 2015; (https://digital.library.unt.edu/ark:/67531/metadc701362/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .