APA (7e ed.) Bronvermelding
Grazia, A. d. (1949). Roberto Michels' first lectures in political sociology. Harper Torchbooks.
Chicago (17e ed.) Bronvermelding
Grazia, Alfred de. Roberto Michels' First Lectures in Political Sociology. New York: Harper Torchbooks, 1949.
MLA (9e ed.) Bronvermelding
Grazia, Alfred de. Roberto Michels' First Lectures in Political Sociology. Harper Torchbooks, 1949.
Let op: Deze citaties zijn niet altijd 100% accuraat.