Academic Search Complete
To locate reviews, in the first search box, type the title of the play and the phrase "theater reviews." For example:
hamlet and theater reviews
"Something Wicked This Way Comes" and "theater reviews"
If you wish to broaden your search out to discover films as well as stage productions, type the title of the play into the first search box, and then limit your search to "Entertainment Reviews" in the "Document Type: section of the search page.