6Christopher Braider, "The paradoxical sisterhood. 'ut picture poesis,'" The Cambridge History of Literary Criticism, Vol. 3, The Renaissance, Glyn P. Norton ed. , Cambridge. Cambridge University Press, 1999, pp. 168- 175.
9Fabrizio della Seta, "New currents in the libretto", The Cambridge Companion to Verdi, Scott L. Balthazar ed. , Cambridge.. Cambridge University Press, 2004, pp. 79 -80.
