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You can't put a price tag on a survey participant's enjoyme.. 

, In: Journal of advertising research / Advertising Research Foundation
the latest findings from the ARF's "Foundations of quality"... 
Walker, Robert W. ; Cook, William A.. (2013)  3 - p. 254-257
Exemplar:  Zentrale:E02 z bwl 400 jc/279; Zentrale:Magazin Zs fc 5279