Michels , R. (1966). Political parties: A social-ogical study of the oligarchic al tendencies of modern democracy. Free Press.
Lua i Stíl Chicago (17ú heag.)Michels , Robert. Political Parties: A Social-ogical Study of the Oligarchic Al Tendencies of Modern Democracy. New York: Free Press, 1966.
Lua MLA (9ú heag.)Michels , Robert. Political Parties: A Social-ogical Study of the Oligarchic Al Tendencies of Modern Democracy. Free Press, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.