Calderón de la Barca, Pedro, Life Is a Dream, translated by Edward and Elizabeth Huberman, in The Golden Age, selected and introduced by Norris Houghton, Dell, 1963, pp. 86-89.

De Armas, Frederick A., The Return of Astraea: An Astral-Imperial Myth in Calderón, University Press of Kentucky, 1986, p. 122.

Pico della Mirandola, Giovanni, Oration on the Dignity of Man, available online at http://cscs.umich.edu/~crshalizi/Mirandola (August 31, 2005).

Sloman, A. E., “The Structure of Calderón's La vida es sueño,” in Critical Essays on the Theatre of Calderón, edited by Bruce W. Wardropper, New York University Press, 1965, pp. 90-91.