SELECTED BIBLIOGRAPHY

Deming, W.E., Some Theory of Sampling , Dover Publications, New York, 1950 .

Sudman, S. and Bradburn, N.M., Asking Questions: A Practical Guide to Questionnaire Design , Jossey-Bass, San Francisco, 1982 .

Williams, B., A Sampler on Sampling , John Wiley & Sons, New York, 1978 .