Cascardi, Anthony J., The Limits of Illusion: A Critical Study of Calderón, Cambridge University Press, 1984.

Cascardi studies Calderón's work with regard to the literary and philosophical currents of his time and probes his treatment of illusion and skepticism in all his plays.

Freud, Sigmund, The Interpretation of Dreams, edited and translated by James Strachey, Avon Books, 1980.

Freud's dream book, first published in 1900, is one of the most important and influential books of the twentieth century. In it, Freud advances the theory that dreams are essentially wishes that are represented in a mystifying manner in order to evade the censorship of internalized social constraints.

Fulton, J. Michael, “In Defense of Clotaldo: Reconsidering the Secondary Plot in Calderón's La vida es sueño,” in Rocky Mountain Review of Language and Literature, Vol. 56, No. 1, Spring 2002, pp. 11-23.

Citing the body of...