Below are quotes from some of the books and articles that have references my work.
Terrorism TV: Popular Entertainment in Post-9/11 (Cultureamerica)
"Clear Channel executives deny having banned any songs, but they did allow local stations to set their own policies, which resulted in an informal ban. Censorship activities undertaken by Cumulus were more top-down, perhaps because the network had close ties to the Bush administration and the military. See William Hart, "The Country Connection: Country Music, 9/11, and the War on Terrorism," in The Selling of 9/11: how a National Tragedy Became a Commodity, ed. Dana Heller (New York Palgrave MacMillan, 2005)" (Takacs, 2012, p. 247).