@book{75071,
	author = {Barranco Valderrama, Teodoro.},
	title = {Control químico de la mancha púrpura (Alternaria porri (Ellis) Cif.) de la cebolla (Allium cepa L.) en Chapingo, México},
	publisher = {El autor,},
	year = {1997.},
	address = {Chapingo, Méx. :}
}