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  1. 1

    Validity in survey research with special reference to the techniques of intensive interviewing and progressive modification for testing and constructing difficult or sensitive meas... por Belson, William A.

    Publicado em 1986
    Livro

    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
  2. 2

    Public opinion and historians interdisciplinary perspectives por Small, Melvin

    Publicado em 1970
    Livro

    Public opinion and historians interdisciplinary perspectives

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