@book{30067,
	author = {Naciones Unidas. Departamento de Asuntos Económicos y Sociales.},
	title = {Yearbook of international trade statistics, 1950-},
	publisher = {Naciones Unidas,},
	year = {1952-},
	address = {New York :},
	note = {La bilioteca tiene : 1961, 1976}
}