Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://www.smow.com/blog/wp-content/uploads/2018/10/Peter-Behrens-Art-and-Technology-LVR-Industriemuseum-Oberhausen-Peter-Behrens-Bau.jpg
http://de.wikipedia.org/wiki/Gutehoffnungsh%C3%BCtte
https://upload.wikimedia.org/wikipedia/commons/a/a3/Architekturfotografie_Peter-Behrens-Bau.jpg
https://www.epdlp.com/edificio.php?id=6853
http://www.urbipedia.org/index.php?title=Peter_Behrens