Bloom, Harold. Shakespeare: The Invention of the Human. New York: Riverhead Books, 1999.
Boris, Edna Z. Shakespeare’s English Kings: The People and the Law. Rutherford, NJ: Fairleigh Dickinson University Press, 1978.
More, St. Sir Thomas. History of King Richard III. New Haven: Yale University Press, 1976.
Pollard, A.J. Richard III and the Princes in the Tower. Stroud: Sutton Publishing, 1991.
Ross, Charles D. Richard III. Berkeley: University of California Press, 1981.
Spivack, Bernard. Shakespeare and the Allegory of Evil. New York: Columbia University Press, 1958.
Weir, Alison. The Wars of the Roses. New York: Ballantine, 1996.
Richard III is a fun read because the king is so evil. I'm reading all of Shakespeare by his 450th birthday, and this play gave me a great gift idea. See my blog about Richard III and a present for the Bard: