http://www.arteespana.com/miguelangelbuonarroti.htm https://www.youtube.com/watch?v=QkW-wy1cMVI http://www.academiaflorencia.com/ http://historiaybiografias.com/arte07/ https://www.youtube.com/watch?v=xnWpEHLB5ho http://www.taringa.net/posts/apuntes-y-monografias/11998547/Los-Inventos-de-Da-Vinci-Megapost.html https://www.youtube.com/watch?v=PV6T_kOWZbk http://www.ralphsteadmanartcollection.com/collection-view.asp?collection_urn=114