tarde 1902
muensterberg 1912
katona 1951, University of Michigan Consumer Sentiment Index, see also: Consumer Confidence Index
reynaud 1954
strümpel 1976 FU berlin
schmölders 1966, 1969, 1975, 1978 köln
journal of economic psychology 1981 NL UK SK
macfadyen & macfadyen 1986
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