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  1. 1
    Quasi-experimentation : design & analysis issues for field settings /

    Quasi-experimentation : design & analysis issues for field settings / by Cook, Thomas D.

    Published 1979
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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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  3. 3
    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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