Nielsen Business Media, Inc. (December 11, 1961). Billboard. Nielsen Business Media, Inc. p. 22. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
Nielsen Business Media, Inc. (December 11, 1961). Billboard. Nielsen Business Media, Inc. p. 22. ISSN0006-2510. {{cite book}}: |author= has generic name (help)