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