INTERNET http://books.google.es/books/about/Macmillan_encyclopedia_of_architects.html?hl=es&id=d4lUAAAAMAAJ

INTERNET http://www1.alibris-static.com/isbn/9780486473321.gif

INTERNET http://files.hanser.de/zsolnay/pics/3-552-04965-7_2542713643-1126.jpg

http://www.univie.ac.at/geschichtegesichtet/2010/images/2010/placzek.jpg

INTERNET http://preservationalumni.org/Resources/Pictures/Adolf_Placzek.jpg

INTERNET http://www.zipworld.com.au/~lnbdds/home/placzek.htm

INTERNET http://109.123.214.108/ca_media/139478/preview.jpg?1346732741

INTERNET http://109.123.214.108/ca_media/139479/preview.jpg?1346732742