JSTOR provide electronic access to archives of Arts journals - it is a major resource for history students and one you will become very familiar with if you are not already! JSTOR are now on Facebook (further details here) - there are two JSTOR applications:
JSTOR Information gives guidance on how to search JSTOR, frequently asked questions and links to further help pages.
JSTOR Search application allows you to search for journal articles from within Facebook.
There are also JSTOR tutorials available on YouTube - How to Search JSTOR and How to Browse JSTOR.
If you find any other Facebook applications helpful for finding information for essays, leave details as a comment.