Nielsen Business Media, Inc. (6 February 1971). Billboard. Nielsen Business Media, Inc. pp. 58–. ISSN0006-2510. Retrieved 14 July 2013. {{cite book}}: |author= has generic name (help)
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Nielsen Business Media, Inc. (6 February 1971). Billboard. Nielsen Business Media, Inc. pp. 58–. ISSN0006-2510. Retrieved 14 July 2013. {{cite book}}: |author= has generic name (help)