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Inc, Nielsen Business Media (March 17, 1958). "Billboard". Nielsen Business Media, Inc. – via Google Books. {{cite web}}: |last= has generic name (help)
Inc, Nielsen Business Media (June 23, 1958). "Billboard". Nielsen Business Media, Inc. – via Google Books. {{cite web}}: |last= has generic name (help)
Inc, Nielsen Business Media (December 1, 1958). "Billboard". Nielsen Business Media, Inc. – via Google Books. {{cite web}}: |last= has generic name (help)
Inc, Nielsen Business Media (February 27, 1961). "Billboard". Nielsen Business Media, Inc. – via Google Books. {{cite web}}: |last= has generic name (help)