Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://archleague.org/2010/12/cass-gilbert-elected-league-president/
http://wirednewyork.com/forum/showthread.php?t=3434&page=14
http://www.1st-art-gallery.com/Kenyon-Cox/Cass-Gilbert-(1859-1934)-1907.html