@book{46394,
	author = {Pérez García, Ponciano. and INIA. México. Campo Agrícola Experimental Valle de México.},
	title = {Negro Puebla},
	publisher = {Campo Agrícola Experimental Valle de México,},
	year = {1976},
	series = {INIA. Circular CIAMEC},
	address = {Chapingo, Méx. :}
}