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  1. 1
    by Belson, William A.
    Published 1986
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    Validity in survey research : with special reference to the techniques of intensive interviewing and progressive modification for testing and constructing difficult or sensitive measures for use in survey research : a report /
  2. 2
    by Kvale, Steinar, 1938-2008
    Published 2015
    “...The social construction of validity --...”
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    InterViews : learning the craft of qualitative research interviewing /
  3. 3
    by Saris, Willem E.
    Published 2007
    “...Estimation of reliability, validity and method effects --...”
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    Design, evaluation, and analysis of questionnaires for survey research /

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