1. Adorno, Theodore (2005) [1951]. Minima Moralia. Transl. Dennis Redmond. (Accessed February 17 2017).
2. Anon. (1938). Madrid Zoo Elephant Dies: A War Casualty. The Washington Post. January 5: X3.
3. Azaña, Manuel (1981). Memorias políticas y de guerra. Vol. 2. Barcelona: Editorial Crítica.
4. Baker, Carlos (1952). Hemingway. The Writer as Artist. Princeton, New Jersey: Princeton UP.
5. Barea, Arturo (1946). The Clash. Transl. Ilsa Barea. London: Faber and Faber.