The best place to start your search. Citations and full text for many theatre journals, and some books. Titles include:
Asian Theatre Journal
Contemporary Theatre Review
South African Theatre Journal
TDR (The Drama Review)
Theatre History Studies
PDF full text for several scholarly journals in Performing Arts, from their first issues up to about 5 years ago. (For example, JSTOR has Theatre Journal for 1979-2010; the Project Muse database has Theatre Journal from 1996 to the current issue.)
Best way to identify magazine articles from 1890 to 1982. Ask the reference librarian for assistance; most articles are not in full text in this database, but some are on our shelves, and the others can be obtained on interlibrary loan.
If you’re looking for reviews of plays, interviews from newspapers, etc., consult the reference librarian for the best databases.