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WikiPedia: Vườn bách thú http://www.merriam-webster.com/dictionary/zoo http://www.zoos-worldwide.de/ http://www.asianelephant.net/ http://www.doaks.org/publications/doaks_online_pub... http://www.doaks.org/publications/doaks_online_pub... http://www.zoohistory.co.uk/downloads http://www.zoonews.ws/IZN/316/IZN-316.htm#lost https://web.archive.org/web/20081217084841/http://... https://web.archive.org/web/20080804041323/http://... https://web.archive.org/web/20110531130026/http://...