The discriminant validity among expertise, trustworthiness and likeability was assessed, and the relationship of these three variables with constructs from the theory of reasoned action (Ajzen & Fishbein, 1980) was examined. The discriminant validity between these three source characteristics was supported. In addition, general support was found for hypotheses regarding their relationships to variables in the theory of reasoned action.
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O′Hara et al. (1991) studied this question.
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