@book{63692,
	author = {Leff , Enrique and Centro de Investigaciones interdisciplinarias en Ciencias y Humanidades. UNAM},
	title = {Saber ambiental },
	publisher = {Siglo XXI Editores},
	year = {2007},
	series = {Ambiente y Democracia},
	address = {México D.F. (México)},
	edition = {5a. ed.}
}