@book{240741,
	author = {Gass, Susan M.},
	title = {Linguistic perspectives on second language acquisition},
	publisher = {Cambridge University Press},
	year = {1990.},
	series = {The Cambridge applied linguistic [sic] series},
	address = {Cambridge [England]},
	url = {http://www.loc.gov/catdir/toc/cam031/89000451.html}
}