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WikiPedia: Nô_lệ http://allafrica.com/stories/200708211080.html http://www.britannica.com/blackhistory/article-241... http://school.discoveryeducation.com/schooladventu... http://abcnews.go.com/International/Story?id=81361... http://books.google.com/books?id=osZnIiqDd4sC&pg=P... http://books.google.com/books?id=yxNgXs3TkJYC http://www.history.com/topics/slavery http://www.questia.com/PM.qst?a=o&d=105900244 http://www.questia.com/PM.qst?a=o&d=25779117 http://www.questia.com/PM.qst?a=o&d=5002427959