Hippler, H.-J./Schwarz, N. (1992): The impact of administration modes on response effects in surveys. ZUMA Arbeitsbericht Nr. 92/14. Mannheim, ZUMA
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Hippler, H. J. S., N. (1992). The impact of administration modes on response effects in surveys. Mannheim, ZUMA: ZUMA Arbeitsbericht,(92).
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