@book{13820,
	author = {Koeslag, Johan H, and Castellanos Echeverría, A. Fernán,},
	title = {Porcinos /},
	publisher = {Trillas,},
	year = {1989.},
	series = {Manuales de Educación Agropecuaria. Producción Animal; 5},
	address = {México :},
	edition = {2.}
}