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2
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Focus groups : a practical guide for applied research / Richard A. Krueger.
- 361.61068 K941 1994
- Krueger, Richard A.,
- Sage Publications,
- Thousand Oaks, California :
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Case study research : design and methods / Robert K. Yin.
- 300.723 Y515 1994
- Yin, Robert K.,
- Sage Publications,
- Thousand Oaks, California :