1. The prevalence and socio-demographic correlates of khat chewing in Butajira, Ethiopia;Alem;Acta Psychiatrica Scandinavica,1999
2. Khat (Catha edulis) – an updated review;Al-Hebshi;Addiction Biology,2005
3. The khat users: a study of khat chewing in Liverpool׳s Somali men;Ahmed;Medicine, Science, and The Law,1998
4. The magnitude of khat use and its association with health, nutrition and socio-economic status;Belew;Ethiopian Medical Journal,2000
5. Immigration, acculturation, and adaptation;Berry;Applied Psychology: An International Review,1997