1. Herbicides - current research and case studies in use;Bailey,2003
2. Case storage on Tobacco Cultivation and possible alternative crops in Kenya;Ochola,2007
3. Production, physiology and biochemistry of tobacco plant;Tso,2005
4. The Economics of Tobacco Use and Tobacco Control in the Developing World.” A background paper for the high level round table on tobacco control and development policy organized by the European Commission;World Bank,2003