The links below lead to a variety of databases with primary sources. These are likely to be useful, but may not have quite what you need. Please ask a librarian if you are looking for something you don't see here!
However, primary sources exist beyond the digital world. Some may be in printed books, or Princeton's Special Collections. Again, ask a librarian!
Contains over 1,500 audio-visual items found within the University Archives. 1912-2000
Over 5,000 play scripts, 900 scholarly theater books, and streaming content from the National Theatre, the Royal Shakespeare Company, Shakespeare’s Globe, Stratford Festival, L.A. Theatre Works, and many more.
A large collection of English-language plays from the late 1800s to the early 2000s. It features plays from over 300 well- and lesser-known dramatists.
Full-text access to over 40,000 poems by over 200 poets. 1600-1900