Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://www.iberlibro.com/servlet/BookDetailsPL?bi=22670244616&searchurl=an%3Dhoffmann%2Bherbert%26ds%3D30%26rollup%3Don%26sortby%3D17%26tn%3Dmoderne%2Bbauformen%2Bmonatshefte%2Barchitektur%2Braumkunst&cm_sp=snippet-_-srp0-_-image7