Drama for Students is a 30 volume encylopedia Van Wylen has as a part of its eReference collection. It contains essays on over 550 plays and provides summaries and analysis of themes and historical context, as well as bibliographies of additional resources. The easiest way to see if it contains the play you are researching is to do an advanced search in Gale eBooks. Enter the play or playwrite in the first search box and "Drama for Students" in the second, and change the dropdown to Publication.
There are also many print reference books, located on the 1st floor of Van Wylen and in the stacks. The are located in the PN1600-3000 section.
Browse a list of Print Reference Titles in Primo
Here are a few highlights: