Bloch, E. (1991). Le principe esperance. Gallimard.
Lua i Stíl Chicago (17ú heag.)Bloch, Ernst. Le Principe Esperance. Paris: Gallimard, 1991.
Lua MLA (8ú heag.)Bloch, Ernst. Le Principe Esperance. Gallimard, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.