1. Khat (Qat): Assessment of Risk to Individual and Communities in the UK;Advisory Council on the Misuse of Drugs,2005
2. Khat-induced psychosis and its medico-legal implication: a case report;Alem;Ethiopian Journal of Medicine,1997
3. The potential adverse effects of habitual use of Catha edulis (khat);Al-Habori;Expert Opinion on Drug Safety,2005
4. Khat: pharmacological and medical aspects and its social use in Yemen;Al-Motarreb;Phytotherapy Research,2002
5. The Khat Controversy, Stimulating the Debate on Drugs;Anderson,2007