MLA International Bibliography (MLAIB) is an index to scholarly publications in literature, language, linguistics, and folklore from over 4000 journals published worldwide. This bibliography is assembled under the auspices of the Modern Language Association, the leading professional association for literature and languages scholars. Mostly citation database, with limited access to full text.
ProQuest One Literature is a searchable library of over 500,000 works of English and American literature, overseen by an academic Advisory Board. Broken into 4 parts: the Master Index, Literary Database, Reference Works, and Web Resources.
Literature Criticism Online is an extensive compilation of scholarly and popular literary commentary from broadsheets, pamphlets, encyclopedias, books and periodicals. Helps to trace the history of critical reception.
Literature Resource Center
Biographies and criticism on over 90,000 authors, literary movements, and genres from every age and literary discipline.
Play Index searches over 30,000 plays written from Antiquity to the present and published from 1949 to the present ... . Play Index [includes] plays written in or translated into English, including mysteries, pageants, plays in verse, puppet performances, radio and television plays, and classic drama. Search for plays by title; author; subject (sisters, culture conflict, marriage); style (symbolism, experimental theater); genre (comedy, melodrama, musical); cast type.