@book{61758,
	author = {North, Brian, and ebrary, Inc.},
	title = {The development of a common framework scale of language proficiency},
	publisher = {Peter Lang,},
	year = {c2000.},
	series = {Theoretical studies in second language acquisition,},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10670667}
}