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WikiPedia: Cuộc vây hãm Yorktown http://interactive.ancestry.com/1995/MIUSA1775D_13... http://www.bartleby.com/43/17.html http://books.google.com/books?id= http://www.historynet.com/mhq http://www.ouramericanhistory.com/events/yorktown.... http://www.revolutionarywaranimated.com/YorktownAn... http://xenophongroup.com/mcjoynt/yrtnsieg.htm http://www.xenophongroup.com/mcjoynt/yrkcam-z.htm http://www.brown.edu/Administration/News_Bureau/20... http://eclipse.gsfc.nasa.gov/phase/phases1701.html