@book{591,
	author = {Tafoya Razo, José Antonio},
	title = {Métodos de labranza y control de maleza en la relación Rhizobium leguminosarum Biovar phaseoli- Phaseolus vulgaris L.},
	publisher = {El autor,},
	year = {1990},
	address = {Montecillo, Méx. :}
}