<p>F. Barron and T. Leary, »Changes in Psychoneurotic Patients with and without Psychotherapy,» Journal of Consulting Psychology 19 (1955): 239-245; A. E. Bregin, »The Effects of Psychotherapy: Negative Results Revisited,» Journal of Consulting Psychology 10 (1963): 244-250; R. D. Cartwright and J. L. Vogel, »A Comparison of Changes in Psychoneurotic Patients during Matched Periods of Therapy and No-Therapy,» Journal of Consulting Psychology 24 (1960): 121-127; E. Powers and H. Witmer, An Experiment in the Prevention of Delinquency (New York: Columbia University Press, 1951); C. B.