"ČNS IFPI" (in Czech). Hitparáda – Digital Top 100 Oficiální. IFPI Czech Republic. Note: Change the chart to CZ – SINGLES DIGITAL – TOP 100 and insert 202122 into search. Retrieved 7 June 2021.
"ČNS IFPI". IFPI ČR. Note: Select SK SINGLES DIGITAL TOP 100 and insert 202122 into search. Retrieved 7 June 2021.