"ČNS IFPI" (in Czech). Hitparáda – Radio Top 100 Oficiální. IFPI Czech Republic. Note: Select 32. týden 2011 in the date selector. Retrieved July 25, 2011.
hitparadask.ifpicr.cz
"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: insert 201118 into search. Retrieved May 11, 2011.
"Media Forest – Weekly Charts. Media Forest. 8 August 2011. Retrieved 2 July 2018. Note: Romanian and international positions are rendered together by the number of plays before resulting an overall chart.