Easybib already has a form to cite plays that have been viewed live. However, if you are citing a play from within another text, then follow the chapter / anthology format and use our chapter / anthology form. Also note that plays and other independently published materials in an anthology should be italicized.
Shakespeare, William. Romeo and Juliet. Norton’s Anthology. Chicago: Hampton Publishers, 2004. 55-104. Print.
If you are citing a play found as an entire source, cite this similar to a book, and use our book form.