These databases are all good places to start. Oxford Art Online contains scholarly encyclopedia essays with bibliographies and links to images; the other databases will help you find scholarly articles.
These databases are good places to also look if you didn't find enough in your initial searches.
If you already have a journal citation from an existing bibliography or some other source, use this tool to find the article:
The library subscribes to more journals electronically than we do in print, and we often have access to more years of a journal online than we do in print, as well. These e-journals are the online equivalents of their print versions. They contain pdfs of the individual articles published in them. The links below will show you all the ways you can link to the full text of that journal. You can browse or search within the journal once you have linked to it.
As above, these links connect to the library's catalog, but some of these journals are not available online. Browse them in print by going to the journals section on the east side of the first floor of Jerome Library. All journals are in alphabetical order by title.
While databases like JSTOR contain full text, other databases only contain descriptions of articles. Here's how to get to full text when it's not in the database you're searching:
Click on the "Find it!" link to see if it's available in another database.
If there is full text in another database, you will be taken to the article in that database.
If there is no full text available, you will see a link to Interlibrary Loan (ILL). ILL requests for articles and book chapters are often filled very quickly, because libraries scan the articles and deliver them to you online as a pdf.