@book{38628,
	author = {Villalva Quintana, Sonia. and Fuentes-Pila Estrada, Joaquín.},
	title = {Agricultura sostenible},
	publisher = {Ministerio de Agricultura, Pesca y Alimentación,},
	year = {1993},
	series = {Hojas divulgadoras},
	address = {Madrid :}
}