Format in the UK specified by OFCOM - CHR/Pop - Contemporary / Current / Recurrent hits, may contain older music. [1]
Mass Media Moments in the United Kingdom, the USSR and the USA, by Gilder, Eric. - "Lucian Blaga" University of Sibiu Press, Romania. 2003 ISBN 973-651-596-6
Music in the Air: America's Changing Tastes in Popular Music (1920–1980), by Eberley, P.K. New York, 1982.
Studying Popular Music, by Middleton, Richard. - Philadelphia: Open University Press, 1990/2002. ISBN 0-335-15275-9.
Durkee, Rob. "American Top 40: The Countdown of the Century." Schriner Books, New York City, 1999.
Battistini, Pete, "American Top 40 with Casey Kasem The 1970s." Authorhouse.com, January 31, 2005. ISBN 1-4184-1070-5.
Douglas, Susan, "Listening In: Radio and the American Imagination," New York: Times Books, 1999.
Fong-Torres, Ben, "The Hits Just Keep On Coming: The History of Top 40 Radio", San Francisco: Backbeat Books, 1998.
MacFarland, David, "The Development of the Top 40 Radio Format", New York: Arno Press, 1979.
Fisher, Mark, "Something in the Air: Radio, Rock, and the Revolution That Shaped a Generation", New York: Random House, 2007.
Goulart, Elwood F. 'Woody', "The Mystique and Mass Persuasion: Bill Drake & Gene Chenault’s Rock and Roll Radio Programming [2] 10 Mayıs 2008 tarihinde Wayback Machine sitesinde arşivlendi.", 2006.