Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://www.chicagoseen.com/category/womens-hospital/
http://slog.thestranger.com/slog/archives/2009/03/20/sam-buys-louis-sullivans-1893-chicago-stock-exchange-elevator-facade
http://www.historictheatres.org/richard-nickel-archives-donated-to-art-institute-documented-adler-sullivans-buildings/
http://www.patsabin.com/illinois/stock.htm
http://kids.britannica.com/comptons/art-132733/Dankmar-Adler-designed-the-Chicago-Stock-Exchange-building?&articleTypeId=31
http://www.woodhavenhistoric.com/index.php/chicago-stock-exchange-building-chicago-il-1963-photo-1.html
http://visualingual.wordpress.com/2011/01/25/chicago-stock-exchange-trading-room-by-adler-sullivan/