@book{387,
	author = {Beltran, Enrique and Beltran, Enrique},
	title = {Biologia  /},
	publisher = {Porrua, },
	year = {1962},
	series = {Dos tomos},
	address = {Mexico  },
	edition = {3a ed.},
	note = {Incluye indice}
}