INTERNET
http://cache2.allpostersimages.com/p/LRG/29/2943/ORKRD00Z/posters/viollet-le-duc-eugene-histoire-d-un-hotel-de-ville-et-d-une-cathedrale.jpg

INTERNET
https://www.infolio.ch/livre/histoire-d%E2%80%99un-hotel-de-ville-et-d%E2%80%99une-cathedrale.htm

INTERNET
http://img.alibaba.com/photo/1034395989/Histoire_D_Un_Hotel_de_Ville_Et_D_Une_Cathedrale_1878_by_Viollet_Le_Duc_Eugene_Emmanuel_Hardcover_.jpg

INTERNET
http://img1.imagesbn.com/p/9781166768256_p0_v1_s260x420.JPG