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Freed, Nick (8 April 2011). "Adele:21". Consequence of Sound. Complex Media Network. Archived from the original on 28 October 2021. Retrieved 24 April 2011.
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"Recording Industry in Numbers"(PDF). International Federation of the Phonographic Industry. 2013. p. 10. Archived from the original(PDF) on 9 April 2013. Retrieved 28 June 2023.
Miller, Andrew (26 September 2011). "Adele's New Record". Chart Bitz. Recording Industry Association of New Zealand. Archived from the original on 17 October 2011. Retrieved 28 September 2011.
"Top 50 Albumes 2011"(PDF) (in Spanish). Promusicae. Media Control. GfK International. Archived from the original(PDF) on 23 January 2013. Retrieved 28 January 2012.
"Årslista Album – År 2013" (in Swedish). Sverigetopplistan. Swedish Recording Industry Association. Archived from the original on 12 October 2014. Retrieved 7 March 2014.