Cochran, W. G. (1953). Sampling techniques. Wiley.
Lua i Stíl Chicago (17ú heag.)Cochran, William Gemmell. Sampling Techniques. New York: Wiley, 1953.
Lua MLA (9ú heag.)Cochran, William Gemmell. Sampling Techniques. Wiley, 1953.
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