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Hard rock Hard Candy (album của Madonna) Hardcore punk Hardwell Hard to Say I'm Sorry Hard Rock Cafe Hard house Harder, Better, Faster, Stronger Hard Target Hard (bài hát)Tài liệu tham khảo
WikiPedia: Hard (bài hát) http://pandora.nla.gov.au/pan/23790/20100205-0000/... http://www.billboard.com/charts/year-end/2010/hot-... http://www.billboard.com/charts/year-end/2010/hot-... http://www.riaa.com/gold-platinum/?tab_active=defa... https://www.billboard.com/music/Rihanna/chart-hist... https://www.officialcharts.com/search/artists/Riha... https://swedishcharts.com/showitem.asp?interpret=R... https://charts.nz/showitem.asp?interpret=Rihanna&t... https://web.archive.org/web/20140621100846/http://... https://web.archive.org/web/20160415124842/http://...