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Katy Perry Katy Perry: Part of Me Katy Perry Live: Witness World WideTài liệu tham khảo
WikiPedia: Katy_Perry http://www.austriancharts.at/showitem.asp?interpre... http://www.2dayfm.com.au/scoopla/music/blog/2014/2... http://www.mtv.com.au/kings-of-leon/news/katy-perr... http://smh.com.au/lifestyle/celebrity/documentary-... //nla.gov.au/anbd.aut-an57437293 http://www.jcnet.com.br/Cultura/2011/09/rock-in-ri... http://katyhudson.ca/discography/albuminfo.shtml http://www.toonage.ca/features/sep2108_katy_perry.... http://abcnewsradioonline.com/music-news/2014/4/28... http://www.allaccess.com/top40-mainstream/future-r...