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Sampling for the social survey/ by P. G. Gray and T. Corlett by
Material type: Text Text; Format: print regular print ; Literary form: Not fiction ; Audience: General;
Language: English Publisher: London : Royal Statistical Society, 1950
Availability: Items available for loan: Biblioteca Instituto Mora (1)Location, call number: Regular (G)/902 MIS.18.

The memory factor in social surveys/ by Percy G. Gray by
Material type: Text Text; Format: print regular print ; Literary form: Not fiction ; Audience: General;
Language: English Publisher: [Gran Bretaña : publisher not identified], 1955
Availability: Items available for loan: Biblioteca Instituto Mora (1)Location, call number: Regular (G)/902 MIS.23.