@book{626494,
	author = {Coleman Stephen},
	title = {Measurement and analysis of political systems},
	publisher = {John Wiley        },
	year = {1975},
	series = {Wiley Series in Comparative Studies in Behavioral Sciences Ed by Robert T Holt and John E Turner},
	address = {New York},
	note = {Appendix: p 175-187}
}