@book{208346,
	author = {Mokken, Robert Jan, and ebrary, Inc.},
	title = {A theory and procedure of scale analysis},
	publisher = {Mouton,},
	year = {1971.},
	series = {Methods and models in the social sciences ;},
	address = {The Hague :},
	note = {Originally presented as the author's thesis, University of Amsterdam.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10588534}
}