@book{4106,
	author = {Congreso Centroamericano de Sociología (},
	title = {Ponencias},
	publisher = {UACH. Departamento de Preparatoria Agrícola,},
	year = {1990},
	series = {Cuadernos de investigación},
	address = {Chapingo, Méx. :},
	note = {D52-189}
}