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13 May, 2016 - 13:23
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  2. Claire Selitz, Lawrence S. Wrightsman, and Stuart W. Cook, Research Methods in Social Relations, New York: Holt, Reinhart and Winston, J976, pp. 114-115.
  3. Ian P. Murphy, "Research with Bottom Line in Mind Only," Marketing News, March 3, 1997, p. 10.
  4. Pamela L. Alreck and Robert D. Settle, The Survey Research Handbook, Richard D. Irwin, Inc., 1995.
  5. Seymour Sudman, Applied Sampling, New York: Academic Press, 1976.