Alem, A. & Shibre, T. (1997) Khat induced psychosis and its medico-legal implication: a case report. Ethiopian Medical Journal, 35, 137–141.
Alem, A., Kebede, D. & Kullgren, G. (1999) The prevalence and socio-demographic correlates of khat chewing in Butajira, Ethiopia. Acta Psychiatrica Scandinavica Supplementum, 100, 84–91.
Critchlow, S. & Seifert, R. (1987) Khat-induced paranoid psychosis. British Journal of Psychiatry, 150, 247–249.
Dhadphale, M. & Omolo, O. E. (1988) Psychiatric morbidity among khat chewers. East African Medical Journal, 65, 355–359.
Drake, P. H. (1988) Khat-chewing in the Near East (letter). Lancet, i, 532–533.
Elmi, A. S. (1983) The chewing of khat in Somalia. Journal of Ethnopharmacology, 8, 163–176.
Giannini, A. J. & Castellani, S. (1982) A manic-like psychosis due to khat (Catha edulis Forsk). Journal of Clinical Toxicology, 19, 455–459.
Giannini, A. J., Burge, H., Shaheen, J. M.
et al (1986) Khat: another drug of abuse?
Journal of Psychoactive Drugs, 18, 155–158.
Goudie, A. J. (1987) Importing khat, legal but dangerous (letter). Lancet, ii, 1340–1341.
Gough, S. P. & Cookson, I. B. (1984) Khat induced schizophreniform psychosis in UK (letter). Lancet, i, 455.
Griffiths, P. (1998) Qat use in London: a study of khat use among a sample of Somalis living in London (Home Office Paper 26). London: Stationery Office.
Halbach, H. (1972) Medical aspects of the chewing of khat leaves. Bulletin of the World Health Organization, 47, 21–29.
Kalix, P. (1984) The pharmacology of khat. General Pharmacology, 15, 179–187.
Kalix, P. (1988) Khat: a plant with amphetamine effects. Journal of Substance Abuse and Treatment, 5, 163–169.
Kalix, P. & Braenden, O. (1985) Pharmacological aspects of the chewing of khat leaves. Pharmacological Reviews, 37:2, 149–164.
Kalix, P. & Khan, I. (1984) Khat: an amphetamine-like plant material. Bulletin of the World Health Organization, 62, 681–686.
Kennedy, J. G., Teague, J., Rokaw, W.
et al (1983) A medical evaluation of the use of qat in North Yemen. Social Science and Medicine, 17, 783–793.
Lehmann, T., Geisshüsler, S. & Brenneisen, R. (1990) Rapid TLC identification test for khat (Catha edulis). Forensic Science International, 45, 47–51.
Luqman, W. & Danowski, T. S. (1976) The use of khat (Catha edulis) in Yemen: social and medical observations. Annals of Internal Medicine, 85, 246–249.
McLaren, P. (1987) Khat psychosis (letter). British Journal of Psychiatry, 150, 712–713.
Nencini, P., Ahmed, A. M., Aminconi, G.
et al (1984) Tolerance develops to sympathetic effects of khat in humans. Pharmacology, 28, 150–154.
Nencini, P., Ahmed, A. M. & Elmi, A. S. (1986) Subjective effects of khat chewing in humans. Drug and Alcohol Dependence, 18, 97–105.
Nencini, P., Grassi, M. C., Botan, A. A.
et al (1989) Khat chewing spread to the Somali community in Rome. Drug and Alcohol Dependence, 23, 255–258.
Omolo, O. E. & Dhadphale, M. (1987) Alcohol use among khat (Catha) chewers in Kenya. British Journal of Addiction, 82, 97–99.
Pantelis, C., Hindler, C. G. & Taylor, J. C. (1989) Use and abuse of khat (Catha edulis): a review of the distribution, pharmacology, side effects and a description of psychosis attributed to khat chewing. Pharmacological Medicine, 19, 657–668.
Yousef, G., Huq, Z. & Lambert, T. (1995) Khat chewing as a cause of psychosis. British Journal of Hospital Medicine, 54, 322–326.