@book{39969,
	author = {Hewings, Martin.},
	title = {Advanced grammar in use :},
	publisher = {Cambridge University Press,},
	year = {2005.},
	address = {Cambridge :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0632/2005432966-d.html}
}