1. Clinical and Psychological Effects of Marijuana in Man;Zeinberg;The International Journal of the Addictions
2. Personality Differences between Psychedelic Drug Users and Non Users;Klechner;Psychology,1968
3. 3. McGlothlin, W. H. , Cohen, S. and McGlothlin, M. S. “Personality and Attitude Changes in Volunteer Subjects Following Repeated Administration of L.S.D.” Paper presented March, 1967.
4. 5. Kleber, H. H. “Students Use of Hallucinogens.” Unpublished Manuscript, 1965.