Brecht, A. (1949). Political theory: The foundations of twentieth century political thought. Princeton University Press.
Chicago-referens (17:e uppl.)Brecht, Arnold. Political Theory: The Foundations of Twentieth Century Political Thought. Princeton, N. J: Princeton University Press, 1949.
MLA-referens (9:e uppl.)Brecht, Arnold. Political Theory: The Foundations of Twentieth Century Political Thought. Princeton University Press, 1949.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.