Nielsen Business Media, Inc. (29 October 1949). Billboard. Nielsen Business Media, Inc. pp. 45–. ISSN0006-2510. Retrieved 26 November 2012. {{cite book}}: |author= has generic name (help)
Nielsen Business Media, Inc. (29 October 1949). Billboard. Nielsen Business Media, Inc. pp. 45–. ISSN0006-2510. Retrieved 26 November 2012. {{cite book}}: |author= has generic name (help)