1. Canadian Government Commission of Inquiry. The Non-Medical Use of Drugs: Interim Report of the Canadian Government Commission of Inquiry. New York, Penguin, 1970.
2. Hill, W. F. HIM Interaction Matrix Scoring Manual. University of California: Youth Study Center, 1961.
3. Hill, W. F. HIM: Interaction Matrix. University of Southern California: Youth Study Center, 1965.
4. Osgood, C. E., Suci, G. T., Tannebaum, P. H. The Measurement of Meaning. Urbana: University of Illinois Press, 1857.
5. Page, R. C. “Developmental stages of unstructured counseling groups with prisoners.” Small Group Behavior 10, 271–278, 1979.