Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://www.foroxerbar.com/viewtopic.php?t=5577
http://www.arthermitage.org/Leo-von-Klenze/View-of-the-New-Hermitage-The-Plans-of-the-Ground-and-First-Floors.html
http://www.arthermitage.org/Leo-von-Klenze/New-Hermitage-The-Southern-and-Eastern-Facades.html
http://www.hermitagemuseum.org/html_En/05/hm88_5_2_0.html