Cabrera García, M. I., and G. Pérez Zalduondo. “Unity: A Fundamental Concept for Music and the Arts in the Early Years of the Franco Regime”. Cuadernos De Arte De La Universidad De Granada, vol. 35, Nov. 2004, pp. 183-96, https://revistaseug.ugr.es/index.php/caug/article/view/8914.