Nielsen Business Media, Inc. (29 May 1948). Billboard. Nielsen Business Media, Inc. pp. 57–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
Nielsen Business Media, Inc. (29 May 1948). Billboard. Nielsen Business Media, Inc. pp. 57–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)