Tài liệu tham khảo

WikiPedia: Danh_sách_đĩa_đơn_bán_chạy_nhất_thế_giới http://www.aria.com.au/pages/aria-charts-accredita... http://www.aria.com.au/pages/httpwww.aria.com.auac... http://www.aria.com.au/pages/httpwww.aria.com.aupa... http://www.aria.com.au/pages/httpwww.aria.com.aupa... http://www.aria.com.au/pages/httpwww.aria.com.aupa... http://jam.canoe.ca/Music/Pop_Encyclopedia/J/Jacks... http://www.amazon.com/a-ha/e/B000APZPFU/ref=ac_dpt... http://www.billboard.com/#/column/chartbeat/ask-bi... http://www.billboard.com/#/news/ask-billboard-was-... http://www.billboard.com/column/chartbeat/ask-bill...