1. Check‐List of African Mammals;Allen G. M.;Bull. Mus. Comp. Zool. Harvard,1939
2. Bannerman D. A.(1930).The Birds of British West Africa.–I. London.
3. Baumann O.(1896).Der Sansibar Archipel.–I. Mafia.Leipzig.
4. The Birds of the Belgian Congo.–I;Chapin J. P.;Bull. Amer. Mus. Nat. Hist.,1932
5. Craster J. E. E.(1913).Pemba the Spice Island of Zanzibar.London.