Showing 1 - 2 results of 2 for search 'Schwartz, Richard D.', query time: 0.01s Refine Results
  1. 1
    Unobtrusive measures; nonreactive research in the social sciences

    Unobtrusive measures; nonreactive research in the social sciences by Webb, Eugene J.

    Published 1966
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  2. 2
    Nonreactive measures in the social sciences /

    Nonreactive measures in the social sciences / by Webb, Eugene T.

    Published 1981
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