http://www.galenfrysinger.com/chicago_science_industry_elderhostel.htm

Charles Atwood (izda.)

http://www.thomasyanul.com/arnold1.html

http://www.taconichills.k12.ny.us/webquests/architectwebquestfinal/index.html

chttps://www.google.es/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&docid=uQ9CoU9nZavQYM&tbnid=FA9fV3-Xo86WAM:&ved=0CAQQjhw&url=http%3A%2F%2Fwww.thechicagoloop.org%2Farch.attb.00000.html&ei=JkIjU8XAPIi20QWOhYHIBQ&bvm=bv.62922401,d.d2k&psig=AFQjCNFGlnaHHrtaxxE444agvO0y6aaRXA&ust=1394906018147026