@book{169472,
	author = {Pérez Gómez, José Alfredo and  Córdova Alvarez, Melitón, asesor },
	title = {Urea protegida en la engorda de corderos  /},
	publisher = {El autor,},
	year = {2011},
	address = {Chapingo, México  :},
	url = {http://10.13.5.2/tesis/113705.pdf}
}