BIBLIOGRAPHY
http://science.nationalgeographic.com.au/science/archaeology/rome-catacombs/
http://www.catacombe.roma.it/en/origini.php
http://www.vatican.va/roman_curia/pontifical_commissions/archeo/inglese/documents/rc_com_archeo_doc_20011010_cataccrist_en.html
http://smarthistory.khanacademy.org/byzantine-justinian.html
http://www.artlex.com/ArtLex/b/byzantine.html
http://www.artcyclopedia.com/history/byzantine.html
http://en.wikipedia.org/wiki/Byzantine_art
http://www.historyworld.net/wrldhis/plaintexthistories.asp?historyid=ac59
http://smarthistory.khanacademy.org/Romanesque.html
http://www.slideshare.net/guest39df9a/romanesque-art-1190503
http://www.arteducation.com.au/art-movements/gothic.php
http://www.historyofpainters.com/byzantine.htm
http://www.catacombe.roma.it/en/origini.php
http://www.vatican.va/roman_curia/pontifical_commissions/archeo/inglese/documents/rc_com_archeo_doc_20011010_cataccrist_en.html
http://smarthistory.khanacademy.org/byzantine-justinian.html
http://www.artlex.com/ArtLex/b/byzantine.html
http://www.artcyclopedia.com/history/byzantine.html
http://en.wikipedia.org/wiki/Byzantine_art
http://www.historyworld.net/wrldhis/plaintexthistories.asp?historyid=ac59
http://smarthistory.khanacademy.org/Romanesque.html
http://www.slideshare.net/guest39df9a/romanesque-art-1190503
http://www.arteducation.com.au/art-movements/gothic.php
http://www.historyofpainters.com/byzantine.htm