1. Cochran W.G. Sampling Techniques. 3rd edn. John Wiley and Sons Inc., New York, 1977.
2. Efron B., and Tibshirani R. An Introduction to the Bootstrap. Chapman and Hall, New York, 1993.
3. Ershow A.G., and Cantor K.P. Total Water and Tapwater Intake in the United States: Population-Based Estimates of Quantities and Sources. National Cancer Institute, Bethesda, MD. Order no. 263–Md–810264 1989.
4. Hanson M.H., Hurwitz W.N., and Madow W.G. Sample Survey Methods and Theory. Volume I: Methods and applications. John Wiley and Sons Inc., New York, NY, 1953, pp. 399–419.
5. Kennedy W.J., and Gentle J.E. Statistical Computing. Marcel Dekker Inc., New York, NY, 1980, p. 224.