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2. Hadden, Samuel B.: The utilization of a therapy group in teaching psychotherapy. Am. J. Psychiat., 103:644, 1947.
3. Whitaker, Carl A.; Warkentin, John; and Johnson, Nan: A philosophical basis for brief psychotherapy.Psychiat. Quart., 23:3, 439–443, July 1949.
4. Whitaker, Carl A.; Warkentin, John; and Johnson, Nan: The psychotherapeutic impasse. Unpublished paper read at the 26th annal meeting of the American Orthopsychiatric Association, Chicago, 1949.
5. Dreikurs, Rudolf: The Challenge of Parenthood. Duell, Sloan & Pearce. New York. 1948.