Unobtrusive measures [electronic resource] / Eugene J. Webb ... [et al.].
Material type:![Text](/opac-tmpl/lib/famfamfam/BK.png)
- 9781452243443 (ebook) :
- 300.72 23
- H62 .N675 1999
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Previous ed.: published as Nonreactive measures in the social sciences. 2nd ed. 1981.
Includes bibliographical references and index.
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