@book{250,
	author = {Cruz Ortega, Jacobo Enrique.},
	title = {Extractos de higuerilla, Ricinus cummunis L. y manzanita, Arctostaphylos pungens H.B.K. para el control de la conchuela del frijol en Chapingo, México},
	publisher = {El autor,},
	year = {1990},
	address = {Chapíngo, Méx. :}
}