As the end of the semester approaches a lot of people will be writing papers. Artlex is an art dictionary with definitions for more than 3,600 terms used in discussing art / visual culture, along with thousands of supporting images, pronunciation notes, great quotations and cross-references. In other words...tons of information...there is also a section on the site that explains how to referance back to the site and what the copyright policies are. It is put together by Michael Delahunt who is an art educator and studying for a PhD. The site has been growing for over 10 years.
(image by striatic on Flickr shared via Creative Commons License)