@book{60472,
	author = {Bollen, Kenneth A.,},
	title = {Structural equations with latent variables /},
	publisher = {John Wiley & Sons, Inc.,},
	year = {1989.},
	series = {Wiley Series in Probability and Mathrmatical Statistics},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10925522}
}