1. Measurement of precision attained in sampling;BOWLEY;Bull. Int. Stat. Inst.,1926
2. The estimation of yield in cereal crops by sampling methods;CLAPHAM;Jour. Agri. Sci.,1929
3. The use of analysis of variance in enumeration by sampling;COCHRAN;Jour. Amer. Stat. Ass.,1939
4. Sampling theory when the sampling units are of unequal sizes;COCHRAN;Jour. Amer. Stat. Ass.,1942
5. Sampling Design in Business Research;DEMING,1960