Johns Hopkins Guide to Literary Theory contains contextual info on critics and theorists, plus critical schools and movements.
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Oxford Reference Online provides full-text access to key encyclopedias, dictionaries, and handbooks, including the Oxford Companion to American Theatre.
Blackwell Reference Online is a collection of handbooks and overviews across humanities subject areas.
Credo Reference consists of a large collection of online reference materials across numerous subject areas.
Cambridge Companions Online contains thousands of introductory essays on major writers, artists, topics, and periods.
The Oxford English Dictionary is the guide to the meaning, history, pronunciation, and variant spellings of words, both present and past.