Nielsen Business Media, Inc. (17 March 1979). Billboard. Nielsen Business Media, Inc. pp. 42–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
Nielsen Business Media, Inc. (17 March 1979). Billboard. Nielsen Business Media, Inc. pp. 42–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)