"ČNS IFPI". IFPI ČR. Note: Select SK SINGLES DIGITAL TOP 100 and insert 20215 into search. Retrieved 5 April 2021.
ifpicr.cz
"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: Select 10. týden 2021 in the date selector. Retrieved March 15, 2021.