Oxford English Dictionary (OED)
The editors of the OED describe it as the "definitive record of the English language" for good reason - it not only provides definitions, but also etymologies of words as well as some of the earliest written examples of each.
MLA International Bibliography
Maintained by the Modern Language Association, the database covers literature, languages, linguistics, and folklore from over 4,000 journals and series published worldwide.
Biography and Context
The links below will take you to sources that will provide overviews of the writers you've been studying this term, including some of the themes that permeate their work. Both contain more than just biographical information, including literary criticism and other kinds of resources.