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2
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Polls & surveys : understanding what they tell us / Norman M. Bradburn, Seymour Sudman.
- 303.38 B7982
- Bradburn, Norman M.,
- Jossey-Bass,
- San Francisco :
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Improving interview method and questionnaire design / Norman M. Bradburn, Seymour Sudman ; with the assistance of Edward Blair [and others].
- 300.723 B7982
- Bradburn, Norman M.,
- Jossey-Bass,
- San Francisco :