Harrington, M. (1990). Socialism: Past and present. Penguin.
Lua i Stíl Chicago (17ú heag.)Harrington, Michael. Socialism: Past and Present. New York: Penguin, 1990.
Lua MLA (9ú heag.)Harrington, Michael. Socialism: Past and Present. Penguin, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.