@book{168949,
	author = {National Research Council.  Washington.},
	title = {Nutrient requirements of horses  /},
	publisher = {National Academies Press,},
	year = {1989},
	series = {Animal Nutrition Series (National Academies of Sciences, Engineering, and Medicine)},
	address = {Estados Unidos de América :},
	edition = {5a ed.},
	note = {ej.1: 169279}
}