@book{20180,
	author = {Lapesa, Rafael and Menéndez Pidal, Ramón},
	title = {Historia de la lengua española},
	publisher = {Gredos, },
	year = {1985.},
	address = {Madrid : },
	edition = {9a ed.},
	note = {Nota : Prólogo de Ramón Menéndez Pidal}
}