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hitparadask.ifpicr.cz
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"Portugal Digital Songs". Billboard. October 4, 2008. Archived from the original on September 4, 2018. Retrieved February 2, 2025.(subscription required)
"Le Cifre di Vendita"(PDF) (in Italian). Federazione Industria Musicale Italiana. Archived from the original(PDF) on March 27, 2009. Retrieved February 3, 2025.