Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://www.npg.org.uk/collections/search/portraitLarge/mw16592/Sir-Balthazar-Gerbier
http://upload.wikimedia.org/wikipedia/commons/b/b8/Balthasar_Gerbier_-_Het_Gulden_Cabinet.png