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Dowling, John, "Buero Vallejo's Interpretation of Goya's 'Black Paintings,"' in Hispania Vol. 56, No. 2, 1973, pp. 449-57.

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Halsey, Martha, Antonio Buero Vallejo, Twayne, 1973, p. 124.

Kronik, John W., "Buero Vallejo y su sueno de la razon," in El Urogallo, Nos. 5-6, October-November-December, 1970, p. 156.

Nicholas, Robert B., The Tragic Stages of Antonio Buero Vallejo, 1972, No. 23 in the series, Estudios de Hispanofila, Department of Romance Languages, University of North Carolina, p. 96-97.