1. Charrier, A. and Berthaud, J. (1985). Botanical classification of coffee. In:Coffee: Botany, Biochemistry and Production of Beans and Beverage.(Clifford, M. N. and Willson, K. C., Eds.). Croom Helm Publishing Company, London, UK. 13–47.
2. Etienne, H. (2005). Somatic embryogenesis protocol: coffee (Coffea arabicaL. andC. canephoraP.). In:Protocols for Somatic Embryogenesis in Woody Plants.(Jain, S. M. and Gupta, P. K., Eds.). Springer, Dordrecht, The Netherlands. 167–179.
3. Lashermes, P., Bertrand, B. and Etienne, H. (2009). Breeding coffee (Coffea arabica) for sustainable production. In:Breeding Plantation Tree Crops: Tropical Species.(Jain, S.M. and Priyadarshan, P.M., Eds.). Springer, Dordrecht, The Netherlands. 525–543.
4. USDA (2011).Coffee: World Market and Trade.USDA, Washington, D.C., USA. 26 pp.