I found these two books to be particularly helpful in learning dramaturgy. Ghostlight also has a section on different theories to use when analyzing a text. I was already familiar with these from my anthropology courses but the refresher was helpful. Ghostlight was also written cleanly and not bogged down with a lot of academic language which I found in other texts on theory. Both are from Southern Illinois University Press.
http://www.siupress.com/books/978-0-8093-2952-6
