@book{18646,
	author = {Hyman, Herbert Hiram},
	title = {Diseño y anãlisis de las encuestas sociales},
	publisher = {Amorrotu},
	year = {1971},
	series = {Biblioteca de sociologia},
	address = {Buenos Aires},
	note = {Translation of :Survey design and analysis. Principles, cases and procedures.}
}