@book{229139,
	author = {Barreto de Colón, Herodina.},
	title = {Manual de español comercial :},
	publisher = {Editorial Universitaria, Universidad de Puerto Rico ,},
	year = {1976, reimp. 1988.},
	address = {Río Piedras :},
	edition = {4. ed. rev. y amp.}
}