^Robert D. Putnam, Robert Leonardi, Raffaella Y. Nanetti; Robert Leonardi, Raffaella Y. Nanetti. Making Democracy Work: Civic Traditions in Modern Italy. Princeton University Press. 1994. ISBN0691078890.引文使用過時參數 (幫助)
^United Nations. Department of Economic and Social Affairs united nations. department of economic and social affairs. Popular participation in decision making for development. New York. 1975.