United States. Federal Communications Commission. FCC Reports, Second Series, Volume 15, November 15, 1968 to January 31, 1969, report, 1969-01~; (https://digital.library.unt.edu/ark:/67531/metadc306638/m1/1/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .