"Data based on surveys carried out in 1990-1991 by the European Values Study (www.europeanvalues.nl), in 1995-1996 by the World Values Surveys (www.worldvaluessurvey.org), and in 1999-2000 by Tilburg University in collaboration with Zentralarchiv für Empirische Sozialforschung (ZA) in Cologne and the Netherlands Institute for Scientific Information Services in Amsterdam (NIWI). Includes bibliographical references." (Verlagsinformation)
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