Bloom, Harold. Shakespeare: The Invention of the Human. New York: Riverhead Books, 1998.
Granville-Barker, Harley. Prefaces to Shakespeare I. Princeton: Princeton University Press, 1978.
Shakespeare, William. Cymbeline, Robert B. Heilman, Ed. New York: Penguin Books, 1979.
Wells, Stanley, and Taylor, Gary. William Shakespeare: The Complete Works. Oxford: Clarendon Press, 1994.
I just finished Cymbeline in quest to read all Bard's plays by next April. Entertaining play, lots of twists, and I have a theory. In case you're interested, check it out on my blog of the play: