Cita APA (7th ed.)

Michels, R., Paul, E., & Paul, C. (1958). Political parties: A sociological study of the oligarchical tendencies of modern democracy. Free Press.

Cita Chicago (17th ed.)

Michels, Robert, Eden Paul, i Cedar Paul. Political Parties: A Sociological Study of the Oligarchical Tendencies of Modern Democracy. Glencoe, Illinois: Free Press, 1958.

Cita MLA (9th ed.)

Michels, Robert, et al. Political Parties: A Sociological Study of the Oligarchical Tendencies of Modern Democracy. Free Press, 1958.