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Umfragenmethoden (survey research methods)
Schwarz, Norbert
; Hippler, Hans-Jurgen. (1996). Umfragenmethoden (survey research methods). In Goebl, Hans, Nelde, P. H., Stary, Z., Wolck, W. (Ed.), Kontaktlinguistik : ein internationales Handbuch zeitgenossischer Forschung. 726-733.