Rohrschneider, Robert (February 1994). “How iron is the iron law of oligarchy?.: Robert Michels and national party delegates in eleven West European democracies”. 《European Journal of Political Research》 25 (2): 207–238. doi:10.1111/j.1475-6765.1994.tb00418.x. ISSN0304-4130.
ingentaconnect.com
Darcy K. Leach, The Iron Law of What Again? Conceptualizing Oligarchy Across Organizational Forms, Sociological Theory, Volume 23, Number 3, September 2005, pp. 312-337(26). IngentaConnect
worldcat.org
Rohrschneider, Robert (February 1994). “How iron is the iron law of oligarchy?.: Robert Michels and national party delegates in eleven West European democracies”. 《European Journal of Political Research》 25 (2): 207–238. doi:10.1111/j.1475-6765.1994.tb00418.x. ISSN0304-4130.