Hot n Cold (Catalan Wikipedia)

«Top 50 Cançons». Arxivat de l'original el 2009-04-19. [Consulta: 8 setembre 2011].
«Spanish Singles Chart - Search for: Katy Perry». Spanishcharts.com. [Consulta: 19 febrer 2009].

riaa.com (Global: 153^rd place; Catalan: 606^th place)

«Gold & Platinum - Katy Perry». Recording Industry Association of America. [Consulta: 17 febrer 2009].

rianz.org.nz (Global: 9,877^th place; Catalan: 9,706^th place)

«Rianz Singles Chart». Arxivat de l'original el 2012-05-25. [Consulta: 8 setembre 2011].
«The Official New Zealand Music Chart 19 January 2009» (PDF). Recording Industry Association of New Zealand. Arxivat de l'original el 25 de desembre 2012. [Consulta: 19 febrer 2009].
«RIANZ Annual Top 50 Singles Chart 2008 (see "2008 – Singles")». Recording Industry Association of New Zealand. Arxivat de l'original el 2013-08-27. [Consulta: 26 desembre 2009].

swisscharts.com (Global: 438^th place; Catalan: 2,862^nd place)

«The Official Swiss Charts and Music Community - Search for: Katy Perry». Swisscharts.com. [Consulta: 19 febrer 2009].
«2008 Swiss Singles Chart». Hitparade. [Consulta: 25 juliol 2009].

telegrafonline.ro (Global: low place; Catalan: low place)

«Rock-ul, cenzurat de posturile româneşti de radio» (en romanian). Telegraful. Arxivat de l'original el 2010-02-11. [Consulta: 10 gener 2009].

ukchartsplus.co.uk (Global: 5,200^th place; Catalan: low place)

«UK Year End Chart 2008». ChartsPlus. [Consulta: 14 març 2009].

ultratop.be (Global: 147^th place; Catalan: 1,325^th place)

«Ultratop Belgian Charts - Singles 07/02/2009». Ultratop. [Consulta: 19 febrer 2009].
«Jaaroverzichten 2009 (Flanders)» (en dutch). Ultratop. [Consulta: 26 desembre 2009].
«Rapports Annuels 2009 (Wallonia)» (en francès). Ultratop. [Consulta: 26 desembre 2009].

viva.tv (Global: low place; Catalan: low place)

«Charts Year End: German Singles Chart». 'Viva'. Media Control Charts, 29-12-2009. Arxivat de l'original el 2012-04-15. [Consulta: 8 setembre 2011].

web.archive.org (Global: 1^st place; Catalan: 1^st place)

«TheSims2.com - About - The Sims™ 2 FreeTime». Arxivat de l'original el 2010-03-24. [Consulta: 8 setembre 2011].
«Canadian Hot 100». Arxivat de l'original el 2009-05-14. [Consulta: 8 setembre 2011].
«Germany Media Control charts». Arxivat de l'original el 2008-12-04. [Consulta: 8 setembre 2011].
«Music Charts, Most Popular Music, Music by Genre & Top Music Charts». Arxivat de l'original el 2008-06-10. [Consulta: 8 setembre 2011].
«Top 50 Cançons». Arxivat de l'original el 2009-04-19. [Consulta: 8 setembre 2011].
Turkey Top 20 Chart Arxivat 2008-03-30 a Wayback Machine. Retrieved January 26, 2009
«CRIA Gold & Platinum Certification». Canadian Recording Industry Association. Arxivat de l'original el 2016-01-11. [Consulta: 21 setembre 2009].
^{[enllaç sense format]} http://www.bpi.co.uk/certifiedawards/search.aspx Arxivat 2017-10-06 a Wayback Machine.
«Charts Year End: German Singles Chart». 'Viva'. Media Control Charts, 29-12-2009. Arxivat de l'original el 2012-04-15. [Consulta: 8 setembre 2011].
«Rock-ul, cenzurat de posturile româneşti de radio» (en romanian). Telegraful. Arxivat de l'original el 2010-02-11. [Consulta: 10 gener 2009].

webcitation.org (Global: 25^th place; Catalan: 69^th place)

«The Official New Zealand Music Chart 19 January 2009» (PDF). Recording Industry Association of New Zealand. Arxivat de l'original el 25 de desembre 2012. [Consulta: 19 febrer 2009].
«RIANZ Annual Top 50 Singles Chart 2008 (see "2008 – Singles")». Recording Industry Association of New Zealand. Arxivat de l'original el 2013-08-27. [Consulta: 26 desembre 2009].

Hot n Cold (Catalan Wikipedia)

acharts.us (Global: 1,992nd place; Catalan: 2,764th place)

allcharts.org (Global: low place; Catalan: low place)

americatop100.com (Global: low place; Catalan: low place)

archive.today (Global: 28th place; Catalan: 10th place)

aria.com.au (Global: 579th place; Catalan: 2,632nd place)

atrl.net (Global: low place; Catalan: low place)

australian-charts.com (Global: 453rd place; Catalan: 1,228th place)

austriancharts.at (Global: 246th place; Catalan: 2,551st place)

billboard.com (Global: 20th place; Catalan: 129th place)

billboard.com.tr (Global: low place; Catalan: low place)

blender.com (Global: 4,239th place; Catalan: low place)

bpi.co.uk (Global: 220th place; Catalan: 1,297th place)

cotidianul.ro (Global: low place; Catalan: low place)

cria.ca (Global: 7,021st place; Catalan: 6,518th place)

ea.com (Global: 2,963rd place; Catalan: 3,666th place)

thesims2.ea.com

hitlisterne.dk (Global: low place; Catalan: low place)

hot100brasil.com (Global: low place; Catalan: low place)

ifpi.at (Global: 2,178th place; Catalan: 9,272nd place)

launch.yahoo.com (Global: low place; Catalan: low place)

uk.launch.yahoo.com

musikindustrie.de (Global: 851st place; Catalan: 2,837th place)

musiktipps24.com (Global: low place; Catalan: low place)

promusicae.org (Global: low place; Catalan: low place)

riaa.com (Global: 153rd place; Catalan: 606th place)

rianz.org.nz (Global: 9,877th place; Catalan: 9,706th place)

swisscharts.com (Global: 438th place; Catalan: 2,862nd place)

telegrafonline.ro (Global: low place; Catalan: low place)

ukchartsplus.co.uk (Global: 5,200th place; Catalan: low place)

ultratop.be (Global: 147th place; Catalan: 1,325th place)

viva.tv (Global: low place; Catalan: low place)

web.archive.org (Global: 1st place; Catalan: 1st place)

webcitation.org (Global: 25th place; Catalan: 69th place)

acharts.us (Global: 1,992^nd place; Catalan: 2,764^th place)

archive.today (Global: 28^th place; Catalan: 10^th place)

aria.com.au (Global: 579^th place; Catalan: 2,632^nd place)

australian-charts.com (Global: 453^rd place; Catalan: 1,228^th place)

austriancharts.at (Global: 246^th place; Catalan: 2,551^st place)

billboard.com (Global: 20^th place; Catalan: 129^th place)

blender.com (Global: 4,239^th place; Catalan: low place)

bpi.co.uk (Global: 220^th place; Catalan: 1,297^th place)

cria.ca (Global: 7,021^st place; Catalan: 6,518^th place)

ea.com (Global: 2,963^rd place; Catalan: 3,666^th place)

ifpi.at (Global: 2,178^th place; Catalan: 9,272^nd place)

musikindustrie.de (Global: 851^st place; Catalan: 2,837^th place)

riaa.com (Global: 153^rd place; Catalan: 606^th place)

rianz.org.nz (Global: 9,877^th place; Catalan: 9,706^th place)

swisscharts.com (Global: 438^th place; Catalan: 2,862^nd place)

ukchartsplus.co.uk (Global: 5,200^th place; Catalan: low place)

ultratop.be (Global: 147^th place; Catalan: 1,325^th place)

web.archive.org (Global: 1^st place; Catalan: 1^st place)

webcitation.org (Global: 25^th place; Catalan: 69^th place)