Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://www.amazon.com/City-Assembled-Elements-Through-2005-01-17/dp/B01FGP797U/ref=sr_1_18?ie=UTF8&qid=1481811865&sr=8-18&keywords=spiro+kostof
https://www.naoslibros.es/libros/city-assembled-the-elements-of-urban-form-through-history/978-0-500-28172-7/
https://www.amazon.com/City-Assembled-Elements-Through-History/dp/0821219308/ref=asap_bc?ie=UTF8