@book{163024,
	author = {English, Peter R},
	title = {La cerda: cómo mejorar su productividad  /},
	publisher = {El manual moderno,},
	year = {1982},
	address = {México, D. F.  :},
	note = {Trad. de: The sow: improving thed efficiency, 2 ed. de 1982}
}