"Archived copy"(PDF). Archived from the original(PDF) on February 22, 2012. Retrieved October 16, 2013.{{cite web}}: CS1 maint: archived copy as title (link)
ifpicr.cz
ifpicr.cz
"ČNS IFPI" (in Czech). Hitparáda – Radio Top 100 Oficiální. IFPI Czech Republic. Note: Select 21. týden 2009 in the date selector. Retrieved 20 September 2018.
hitparadask.ifpicr.cz
"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: insert 200927 into search.
"Archived copy"(PDF). Archived from the original(PDF) on February 22, 2012. Retrieved October 16, 2013.{{cite web}}: CS1 maint: archived copy as title (link)