@book{226136,
	author = {Sapag Chain, Nassir and Sapag Chain, Reinaldo},
	title = {Preparación y evaluación de proyectos / Nassir Sapag Chain ; Reinaldo Sapag Chain},
	publisher = {Mcgraw - Hill Interamericana},
	year = {2008},
	address = {Mexico DF},
	edition = {5a ed.}
}