@book{28079,
	author = {Gray, Percy G. and Corlett, T. and Royal Statistical Society (Gran Bretaña)},
	title = {Sampling for the social survey/},
	publisher = {Royal Statistical Society,},
	year = {1950.},
	address = {London :},
	note = {Reimpresión de: Journal of the Royal Statistical Society. Series A, volumen 113, part 2 (1950)}
}