There is a large variety of databases, e-texts, and indexes for literary research. Databases may contain citations only, citations and abstracts, and/or full-text. E-texts are always full-text.
The most important resources for beginning research are listed here:
JSTOR offers full-text keyword searching across its entire digital library collection, including images and content from articles, books, and pamphlets. Search results default to content licensed or purchased by the UAlbany Libraries, but you can change this setting for your session. JSTOR provides both Basic and some Advanced Search options, to help you find the content they need.
Guide: How To Use JSTOR