@book{2028,
	author = {Gass, Susan M.},
	title = {Linguistic perspectives on second language acquisition /},
	publisher = {Cambridge University Press,},
	year = {1989.},
	series = {The Cambridge applied linguistic [sic] series},
	address = {Cambridge [England] ;},
	url = {http://www.loc.gov/catdir/toc/cam031/89000451.html}
}