For the most part the resources that playwrights and dramaturgs need pertain to the specific topic or play they're working on. However, there are materials on the theory and practice of these professions, and a few useful websites.
Bennett, M. Y. (2013). Narrating the past through theatre: Four crucial texts. Basingstoke: Palgrave Macmillan.
Bennett, M. Y. (2012). Words, space, and the audience: The theatrical tension between empiricism and rationalism. New York: Palgrave Macmillan.
Bianconi, L., & Pestelli, G. (2003). Opera in theory and practice, image and myth. Chicago: University of Chicago Press.
Carlson, M. (2006). Speaking in tongues: Language at play in the theatre. Ann Arbor: University of Michigan Press.
Dace, W. (1993). Opera as dramatic poetry. New York: Vantage Press.
Jonas, S., Proehl, G. S., & Lupu, M. (1997). Dramaturgy in American theater: A source book. Fort Worth: Harcourt Brace College Publishers.
Klein, D. (1963). The Elizabethan dramatists as critics. New York: Philosophical Library.
LondreĢ, F. H. (2005). Words at play: Creative writing and dramaturgy. Carbondale: Southern Illinois University Press.
Luckhurst, M. (2006). Dramaturgy: A revolution in theatre. Cambridge: Cambridge University Press.
Martin, J., & Sauter, W. (1995). Understanding theatre: Performance analysis in theory and practice. Stockholm: Almqvist & Wiksell.
Slide, A. (1985). Selected theatre criticism. Metuchen, N.J: Scarecrow Press.
Wardle, I. (1992). Theatre criticism. London: Routledge.
