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"Billboard Boxscore". Billboard. Vol. 124, no. 6. New York. February 25, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved February 19, 2012.
"Billboard Boxscore". Billboard. Vol. 124, no. 3. New York. February 4, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved January 31, 2012.
"Billboard Boxscore". Billboard. Vol. 124, no. 1. New York. January 14, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved January 5, 2012.
"Billboard Boxscore". Billboard. Vol. 124, no. 6. New York. February 25, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved February 19, 2012.
"Billboard Boxscore". Billboard. Vol. 124, no. 3. New York. February 4, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved January 31, 2012.
"Billboard Boxscore". Billboard. Vol. 124, no. 1. New York. January 14, 2012. ISSN0006-2510. Archived from the original on January 14, 2012. Retrieved January 5, 2012.