@book{2684,
	author = {Somers, Garld G. and Cushman, Edward L.},
	title = {Ajusting to technological change.},
	publisher = {Harper&Row, },
	year = {1963.},
	address = {New York : },
	edition = {1ra.ed.},
	note = {Notas a pié de página. }
}