The following were among the most useful sources of information used when compiling the invasive plant key and fact sheets:

• AgroForestryTree Database. www.worldagroforestrycentre.org
• Bromilow, C. (2001). Problem Plants of South Africa. A guide to the identification and control of more than 300 invasive plants and other weeds. Briza Publications, Pretoria, 258pp.
• CABI Crop Compendium. CABI Publishing 2011. www.cabi.org/cpc
• CABI invasive species compendium. CABI Publishing 2011. www.cabi.org/isc
• Dharani N. (2006). Field Guide to common trees and Shrubs of East Africa. Struik Publishers, Cape Town, RSA. Germplasm Resources Information Network (GRIN). . National Germplasm Resources Laboratory, National Genetic Resources Program, Agricultural Research Service (ARS), United States Department of Agriculture (USDA), Beltsville, Maryland, USA. www.ars-grin.gov
• GISD (Global Invasive Species Database) www.issg.org/database/welcome
• Global Compendium of Weeds. Hawaiian Ecosystems at Risk Project. www.hear.org/gcw
• Haysom, K.A. and Murphy, S.T. (2003).The status of invasiveness of forest tree species outside their natural habitat: a global review and discussion paper. Forest Health and Biosecurity Working Paper FBS/3E. Forestry Department. FAO, Rome (unpublished). www.fao.org
• Henderson L. (2001). Alien Weeds and Invasive Plants: a complete Guide to declared weeds and invaders in South Africa. Agricultural Research Council. Cape Town RSA.
• Henderson L. (2002). Problem plants in Ngorongoro Conservation Area. Final Report to the NCAA.
• Henderson, L. and Cilliers, C.J. (2002). Invasive aquatic plants—a guide to the identification of the most important and potentially dangerous invasive aquatic and wetland plants in South Africa. PPRI Handbook No. 16, Agricultural Research Council, Pretoria. www.arc.agric.za
• Hill, G., Cock, M. and Howard, G. (1999). Water Hyacinth, its control and utilization. A global review. SIDA Publications on Water Resources, No. 15, 54pp.
• Ibrahim, K. M and Kabuye, C.H.S. (1987) An Illustrated manual of Kenya grasses, FAO, Rome.
• Lazarides, M., Cowley, K. and Hohnen, P. (1997). CSIRO Handbook of Australian Weeds. CSIRO Publishing, Collingwood, Victoria.
• Lyons, E.E. and Miller, S.E. (eds) (1999). Invasive Species in Eastern Africa: Proceedings of a Workshop held at ICIPE, July 5-6, 1999.
• Macdonald, A.W., Reaser, J.K., Bright, C., Neville, L.E., Howard, G.W., Murphy, S.J., Preston, G. (eds) (2003). Invasive Alien Species in South Africa: National Reports and Directory of Resources. GISP, Cape Town, SA.
• Matthews S and Brandt K. (2004). Africa Invaded: The growing danger of invasive alien species. Global Invasive Species Programme.
• Maundu, P. and Tegnas, B. (2005). eds. Useful Trees and Shrubs for Kenya, World Agroforestry Centre, Nairobi.
• Noad, T. and Birnie, A. (1990). A fully illustrated field guide: Trees of Kenya. 2nd ed. T.C. Noad and A. Birnie, Nairobi.
• PIER (Pacific Island Ecosystems at Risk). Plant threats to Pacific ecosystems. www.hear.org/pier.
• Randall, R.P. (2002). Global Compendium of Weeds. R.G. and F.J. Richardson, Victoria, Australia.
• PROTA database. PROTA4U, , a new interactive webdatabase on plants used by people in tropical africa. www.prota4u.org
• Terry, P.J. and Michieka, R.W. (1987). Common weeds of East Africa/Maguga ya Africka Masharaiki. FAO, Rome, 184pp.
• Tropical Biology Association (2010). Usambara Invasive Plants - Amani Nature Reserve - www.tropical-biology.org.
• USDA Plants Profiles. The Plants Database. plants.usda.gov/java/. National Plant Data Center, National Resources Conservation Service, United States Department of Agriculture, Baton Rouge, Louisiana, USA.
• Weber E. (2003). Invasive Plant Species of the World. A Reference Guide to Environmental Weeds. Wallingford, UK: CABI Publishing.