@book{31226,
	author = {Márquez Sánchez, Fidel.},
	title = {Sistemas de producción agrícola},
	publisher = {ENA. Depto. de Fitotecnia,},
	year = {1976},
	series = {Apuntes},
	address = {Chapingo, Méx. :},
	note = {Copias en bodega}
}