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http://www.infoplease.com/encyclopedia/us/willis-tower.html#ixzz2KX58BhDLhttp://www.infoplease.com/encyclopedia/us/willis-tower.html#ixzz2KX58BhDLhttp://www.infoplease.com/encyclopedia/us/willis-tower.html#ixzz2KX58BhDLhttp://www.infoplease.com/ce6/world/A0845498.htmlhttp://www.infoplease.com/ce6/world/A0909775.html

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http://www.willistower.com/safety_security.html

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http://en.wikipedia.org/wiki/File:Sears_Tower_ss.jpghttp://en.wikipedia.org/wiki/Petronas_Twin_Towershttp://en.wikipedia.org/wiki/World_Trade_Centerhttp://en.wikipedia.org/wiki/Willis_Tower#endnote_talleststatushttp://www.willistower.com/safety_security.html

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http://en.wikipedia.org/wiki/Bruce_Grahamhttp://en.wikipedia.org/wiki/Bruce_Grahamhttp://en.wikipedia.org/wiki/Fazlur_Khanhttp://en.wikipedia.org/wiki/Skidmore,_Owings_and_Merrillhttp://en.wikipedia.org/wiki/Skidmore,_Owings_and_Merrillhttp://en.wikipedia.org/wiki/Schindler_Grouphttp://en.wikipedia.org/wiki/Westinghouse_Electric_(1886)http://en.wikipedia.org/wiki/Willis_Tower#cite_note-skyscraperCenter-1http://en.wikipedia.org/wiki/Willis_Tower#cite_note-skyscraperCenter-1http://en.wikipedia.org/wiki/Willis_Tower#cite_note-emporis-2http://en.wikipedia.org/wiki/Willis_Tower#cite_note-skyscraperCenter-1http://en.wikipedia.org/wiki/Willis_Tower#cite_note-skyscraperCenter-1http://en.wikipedia.org/wiki/Willis_Tower#cite_note-skyscraperCenter-1http://toolserver.org/~geohack/geohack.php?pagename=Willis_Tower&params=41.8789_N_-87.6358_E_type:landmark_region:US-ILhttp://toolserver.org/~geohack/geohack.php?pagename=Willis_Tower&params=41.8789_N_-87.6358_E_type:landmark_region:US-ILhttp://toolserver.org/~geohack/geohack.php?pagename=Willis_Tower&params=41.8789_N_-87.6358_E_type:landmark_region:US-ILhttp://en.wikipedia.org/wiki/Geographic_coordinate_systemhttp://en.wikipedia.org/wiki/Chicago

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