David W. Rowden, Ronald C. Dillehay, Jerry B. Michel, Harry W. Martin, Judgments About Candidates for Psychotherapy: The Influence of Social Class and Insight-Verbal Ability, Journal of Health and Social Behavior, Vol. 11, No. 1 (Mar., 1970), pp. 51-58
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Rowden et al. (1970) studied this question.