Schwarz, Norbert, Strack, Fritz, Hippler, Hans-Jürgen & George Bishop (1990): The Impact of Administration Mode on Response Effects in Survey Measurement. ZUMA- Arbeitsbericht Nr. 90/02. Mannheim: ZUMA
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Schwarz, N., Strack, F., Hippler, H. J., Bishop, G. (1990). The Impact of Administration Mode on Response Effects in Survey Measurement. Mannheim: ZUMA. ZUMA- Arbeitsbericht,(90).
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