1. The khat controversy: Stimulating the drugs debate;Anderson,2007
2. Andreas, C. (2008). Prohibition through the back door: Khat in South Africa. Unpublished paper.
3. Avrahami, I. (2004). A qat above the rest. Haaretz. 15.11.2006.
4. What harm? East African perspectives on khat;Beckerleg;African Affairs,2006
5. What harm: Kenyan and Ugandan perspectives on khat;Beckerleg;African Affairs,2006