@book{22234,
	author = {Lightbown, Patsy and Spada, Nina},
	title = {How languages are learned /},
	publisher = {Oxford University Press,},
	year = {2002, 1999},
	series = {Oxford handbooks for language teachers ;},
	address = {Oxford ;},
	edition = {2nd ed.},
	note = {Previous ed.: 1993.}
}