Gabler, Siegfried and Häder, Sabine (2016): "Special challenges of sampling for comparative surveys ". In: The SAGE Handbook of survey Methodology , edited by Christof Wolf, Dominique Joye, Tom W. Smith and Yang-chih Fu, 346-356. London: SAGE. http://dx.doi.org/10.4135/9781473957893.n23. (Eurobarometer)
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Gabler, S., Häder, S. (2016). Special challenges of sampling for comparative surveys ". London: SAGE. The SAGE Handbook of survey Methodology, pp. 346-356.
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