Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://www.amazon.com/History-Architecture-Settings-Rituals/dp/0195083792/ref=sr_1_2?ie=UTF8&qid=1481799580&sr=8-2&keywords=spiro+kostof
https://www.amazon.com/Spiro-Kostof-Architecture-1995-05-19-Hardcover/dp/B002DIWVG8/ref=sr_1_5?ie=UTF8&qid=1481799781&sr=8-5&keywords=spiro+kostof
https://www.amazon.com/history-architecture-settings-original-drawings/dp/B000VZW200/ref=sr_1_17?ie=UTF8&qid=1481811651&sr=8-17&keywords=spiro+kostof