@book{12808,
	author = {Silver, Cheryl Simon and DeFries, Ruth},
	title = {Una sola tierra, un solo futuro},
	publisher = {Tercer Mundo Editores; Ediciones Uniandes,},
	year = {1993.},
	series = {Medio Ambiente},
	address = {Santafé de Bogotá :}
}