^Nielsen Business Media, Inc. (22 December 1956). Billboard. Nielsen Business Media, Inc. pp. 48–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
^Nielsen Business Media, Inc. (29 December 1956). Billboard. Nielsen Business Media, Inc. pp. 36–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)
^Nielsen Business Media, Inc. (13 April 1957). Billboard. Nielsen Business Media, Inc. pp. 85–. ISSN0006-2510. {{cite book}}: |author= has generic name (help)