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  1. 1
    by Morgan, David L.
    Published 1997
    Book

    Focus groups as qualitative research
  2. 2
    by Firebaugh, Glenn
    Published 1997
    Book

    Analyzing repeated surveys
  3. 3
    by Creswell, John W.
    Published 1994
    Book

    Research design qualitative & quantitative approaches
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