@book{37769,
	author = {Bettelheim, Charles.},
	title = {Problemas Teóricos y prácticos de la planificación},
	publisher = {Tecnos},
	year = {1965.},
	address = {Madrid},
	edition = {2da ed.},
	note = {Translation of : Problemes theoriques et pratiques de la planification.}
}