Looking exclusively for scholarly articles?
Look to see if you can limit your search to Scholarly Articles before you search. In most databases, you can do so. JSTOR and MLA International Bibliography only contains scholarly material.
Cambridge Collections Online: Literature and Classics Collection - info
Digital versions of the print Cambridge Companion volumes in Literature, Classics, Philosophy, Religion and Culture.
Academic Search Premier - info
A general database that indexes articles in academic journals, newspapers and magazines covering nearly all academic disciplines.
Proquest Research Library - info
Both popular and scholarly materials that span the academic disciplines.