"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: insert 202131 into search. Retrieved 9 August 2021.
"ČNS IFPI". IFPI ČR. Note: Select SK SINGLES DIGITAL TOP 100 and insert 202130 into search. Archived from the original on 1 April 2019. Retrieved 2 August 2021.
ifpicr.cz
"ČNS IFPI" (in Czech). Hitparáda – Digital Top 100 Oficiální. IFPI Czech Republic. Note: Select 30. týden 2021 in the date selector. Retrieved 2 August 2021.
"ČNS IFPI". IFPI ČR. Note: Select SK SINGLES DIGITAL TOP 100 and insert 202130 into search. Archived from the original on 1 April 2019. Retrieved 2 August 2021.