@book{14706,
	author = {Bowden, Roger J. and Turkington, Darrell A.},
	title = {Instrumental variables /},
	publisher = {Cambridge University Press,},
	year = {1984.},
	address = {Cambridge [Cambridgeshire] ;},
	url = {http://www.loc.gov/catdir/description/cam031/84007802.html}
}