Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://es.wikipedia.org/wiki/Isambard_Kingdom_Brunel
http://www.ikbrunel.org.uk/timeline
http://www.building.co.uk/what-brunel-did-for-us-/3065365.article
https://encrypted-tbn1.gstatic.com/licensed-image?q=tbn:ANd9GcQ819j0-c3Us261Xpp87fN4kO9gF3ODX8d43E4xWkQxP9lL_zkGxfikxJZ0F12ZRg8EBkgICkw2-RpWhQI
https://es.wikipedia.org/wiki/Isambard_Kingdom_Brunel