Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://en.wikipedia.org/wiki/File:CriticalPath.jpg
http://www.goodreads.com/book/show/190038.Critical_Path
http://www.icollector.com/R-Buckminster-Fuller-Inscribed-Critical-Path_i7006987
www.goodreads.com
http://www.calibanbooks.com/pages/books/C000023479/r-buckminster-fuller/critical-path