1. The Egyptian vulture Neophron percnopterus in the former USSR;Abuladze,1998
2. Anonymous, 1998. Anuario Estadı́stico de Fuerteventura. Cabildo Insular de Fuerteventura, Puerto del Rosario.
3. Birds of the Atlantic Islands, vol. I. A History of the Birds of the Canary Islands and of the Salvages;Bannerman,1963
4. Birds of the Atlantic Islands, vol. IV. A History of the Birds of the Cape Verde Islands;Bannerman,1968
5. Trace elements in blood collected from birds feeding in the area around Doñana National Park affected by the toxic spill from Aznalcóllar mine;Benito;The Science of the Total Environment,1999