Tài liệu tham khảo

WikiPedia: Thuần_hóa http://www.adelaide.edu.au/ANZCCART/publications/d... http://edition.cnn.com/2004/TECH/science/04/08/cat... http://www.devbio.com/article.php?ch=23&id=223 http://explorenorth.com/library/weekly/aa080798.ht... http://www.geochembio.com/biology/organisms/cattle... http://www.lifeonterra.com/episode.php?id=191l http://news.nationalgeographic.com/news/2004/04/04... http://www.newscientist.com/article.ns?id=dn6032 http://www.newscientist.com/article/dn4867.html http://cavyhistory.tripod.com/