@book{165928,
	author = {National Research Council. Washington},
	title = {Nutrient requirements of beef cattle  /},
	publisher = {National Academy Press,},
	year = {1996},
	address = {Washington  :},
	edition = {7a ed.},
	note = {ej.1: donación \ ej.2: 226606 \ ej.3 - ej.5: Fotocopias}
}