1. Brown, L., Amadon, D., 1968. Eagles, Hawks and Falcons of the World. Country Life, London.
2. Reintroductions: challenges and lessons for basic ecology;Bullock;Trends in Ecology and Evolution,1997
3. Population viability analysis of captive and released bearded vulture populations;Bustamante;Conservation Biology,1996
4. Cade, T., Enderson, J.H., Thelander, C.G., White, C.M., (Eds.), 1988. Peregrine falcon populations. Their management and recovery. The Peregrine Fund, Boise, ID.
5. Cordero, P.J., Evans, I.M., Parkin, D.T., Galbraith, C.A., 1997. Studies of the genetics of a naturalised population of red kites Milvus milvus in England established by translocation. In: Tew, T.E., Crawford, T.J., Spencer, J.W., Stevens, D.P., Usher, M.B., Warren, J. (Eds.), The role of genetics in conserving small populations, JNCC, Peterborough, UK. pp. 89–96.