Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://elpais.com/diario/2011/02/26/babelia/1298682786_850215.html
http://www.wittgenstein.org.uk/gallery.htm
https://loff.it/society/efemerides/ludwig-wittgenstein-192736/
https://www.biografiasyvidas.com/biografia/w/wittgenstein.htm
https://biblioteca.acropolis.org/anecdotas-filosoficas-wittgenstein-y-el-tren/