Nielsen Business Media, Inc. (2 October 2010). Billboard. Nielsen Business Media, Inc. p. 6. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
Nielsen Business Media, Inc. (2 October 2010). Billboard. Nielsen Business Media, Inc. p. 6. ISSN0006-2510. {{cite book}}: |author= has generic name (help)