@book{180,
	author = {Hed, Sven R.},
	title = {Manual de planificación y control de proyectos /},
	publisher = {Sven R. Hed, },
	year = {1981},
	series = {Sven R. Hed. Series in Management ;},
	address = {Suiza :},
	note = {Manual dividido en 9 secciones con hojas desprendibles},
	url = {https://www.cicy.mx/sitios/sib/doctoelectronico/182.pdf}
}