@book{1206,
	author = {SAPAG CHAIN, NASSIR. and SAPAG CHAIN, REINALDO.},
	title = {PREPARACION Y EVALUACION DE PROYECTOS/ },
	publisher = {MCGRAW-HILL},
	year = {1989},
	address = {MEXICO: },
	edition = {2},
	note = {INCLUYE INDICE.}
}