Tài liệu tham khảo WikiPedia: Amazing Grace http://hotbuzz.bloguez.com/hotbuzz/1150994/-amazin... http://www.caber-records.com/music/amazing-grace.p... http://music.onboom.com/English/16109-Amazing-Grac... http://music.onboom.com/music-online/Nhac-quoc-te/... http://www.snopes.com/religion/amazing.htm http://www.youtube.com/watch?v=B3XdXEJEI4E&feature... http://www.youtube.com/watch?v=GYMLMj-SibU http://www.youtube.com/watch?v=ZJg5Op5W7yw&feature... http://www.antiquebooks.net/readpage.html#hymns http://artofthestates.org/cgi-bin/piece.pl?pid=288
