@book{13661,
	author = {Guarderas, Carlos and Castro León, Alfonso, autor.},
	title = {Texto de biología moderna. /},
	publisher = {No identificado.},
	year = {1971.},
	series = {T.II},
	address = {Quito, Ecuador :},
	edition = {Séptima edición..},
	note = {Incluye índice.}
}