@book{13350,
	author = {Stork, F. C. & J. D. A. Widdowson.},
	title = {Learning about linguistics :},
	publisher = {Hutchinson,},
	year = {1981.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/B001KTQSBK/chopaconline-20}
}