@book{30276,
	author = {Beltrán Martínez, Héctor J.},
	title = {Elementos formales de la Investigación :},
	publisher = {Universidad Santo Tomás,},
	year = {1984.},
	address = {Bogotá :},
	edition = {4a ed.},
	note = {Incluye apéndice.}
}