http://www.chicagomanualofstyle.org/tools_citationguide.html
RIC library main catalog: http://www.ric.edu/adamslibrary/
Research resources by subject: http://www.ric.edu/adamslibrary/resources/resourcesbysubject/art.html
Harvard University Libraries:
http://lib.harvard.edu/
Kunsthistorisches Institut in Florenz: Database for books and articles in art history (search platform in English)
http://opac.khi.fi.it/cgi-bin/hkhi_en.pl