@book{57105,
	author = {Larsen-Freeman, Diane, and Frodesen, Jan,},
	title = {Grammar dimensions:},
	publisher = {Heinle & Heinle Publishers,},
	year = {©1997},
	address = {Estados Unidos de América:},
	edition = {2a. edición},
	note = {Incluye apéndice.}
}