1. Archer , G. Godman , E. M. 1937 The Birds of British Somaliland and the Gulf of Aden. London
2. Bannerman , D. 1930 The Birds of Tropical West Africa. Edinburgh.]
3. Notes on the birds of Kabba, Ilorin, and N. Benin provinces of Nigeria;Brown;Ibis,1948
4. Knight , C. W. R. (n.d.). The Book of the Golden Eagle. London
5. Knight , C. W. R. 1937 Knight in Africa. London