@book{2801,
	author = {Robertson, Dennis H},
	title = {Lecciones sobre principios de economía.},
	publisher = {Tecnos, },
	year = {1961.},
	series = {Semilla y surco.},
	address = {Madrid : },
	edition = {1ra.ed.},
	note = {Notas a pié de página. }
}