@book{86635,
	author = {Lara Rodríguez, Jonatan. and Rodríguez Hilario, Efraín.},
	title = {Actividad reproductiva posparto de vacas holstein en Chapingo, México},
	publisher = {El autor,},
	year = {2002},
	address = {Chapingo, Méx. :}
}