John C. Ball , "Marihuana Smoking and the Onset of Heroin Use ", The British Journal of Criminology, Vol. 7, pp. 408-413, October 1967.
2.
Richard Blum, et al., Utopiates—The Use and Users of LSD-25, New York, Atherton Press, 1964.
3.
John P. Fort , "Heroin Addiction Among Young Men", Psychiatry, U.S.A., Vol. 17, pp. 251-259, August 1954.
4.
Harris, Isbell, "Historical Development of Attitudes Toward Opiate Addiction in the United States" in: Conflict and Creativity, S. M. Farber and R. H. L. Wilson, eds., New York, McGraw-Hill , pp. 154-170, 1963.
5.
Arnold M. Ludwig and Jerome Levine, "Patterns of Hallucinogenic Drug Abuse ", Journal of the American Medical Association, Vol. 191, pp. 92-96, January II, 1965.
6.
William McGlothlin , Sidney Cohen and Marcella S. McGlothlin, "Long Lasting Effects of LSD on Normals", Archives of General Psychiatry, U.S.A., Vol. 17, pp. 521-532, November 1967.
7.
John A. O'Donnell and John C. Ball, eds. Narcotic Addiction, New York, Harper and Row, 1966.
8.
Maurice H. Seevers, "Medical Perspectives on Habituation and Addiction", Journal of the American Medical Association , Vol. 181, pp. 92-98, July I4, 1962.