Looking for a primary source for a play? Try these resources, with thanks to Mrs. Carroll for rounding them up.
http://classics.mit.edu/Search/index.html – Greek and Roman only
http://www.readprint.com/books-6/Plays -Searchable source for play books, search for a title, select it and then Read Online, or with a link to purchase on Amazon, often free from Kindle
http://www.the-noh.com/en/plays/index.html – For Japanese Noh plays synopsis and highlights