"Online download – 2015 Month End Chart - March". Gaon Chart (in Korean). Korea Music Content Industry Association. To view sales from January, February, and March 2015, select "2015년 1월", "2013년 2월", and "2013년 3월", respectively. Retrieved April 21, 2013.
"ČNS IFPI" (in Czech). Hitparáda – Radio Top 100 Oficiální. IFPI Czech Republic. Note: Change the chart to CZ – RADIO – TOP 100 and insert 201215 into search.
"ČNS IFPI" (in Czech). Hitparáda – Digital Top 100 Oficiální. IFPI Czech Republic. Note: Change the chart to CZ – SINGLES DIGITAL – TOP 100 and insert 201425 into search. Retrieved July 3, 2014.
hitparadask.ifpicr.cz
"ČNS IFPI" (in Slovak). Hitparáda – Radio Top 100 Oficiálna. IFPI Czech Republic. Note: insert 201215 into search.