Perhaps the most important resource Art History majors need are scholarly (and often peer-reviewed) journal articles. These can be difficult to find, especially if you rely on the open web. Instead, start in some of these databases to find art-related journal articles. If you find a record for something that isn't full text, you'll need to use InterLibrary Loan to request it.
Want an article that we don't have in the library? Use the FIND FULL TEXT button in the databases. You can also directly link into the InterLibrary Loan (ILL) system to request articles that you find in bibliographies, from your professors, or out there on the Web.
Citing your sources properly -- yes, even the images you use! -- is important and required.
Purdue University's OWL Writing Lab Citation resources are the best ones out there on the web. Generally, Art and Art History courses require that you use either MLA or Chicago style. Detailed information on both styles are availble here.
Diane can help with citations, too!