1. Alerstam T (1990) Bird migration. Cambridge University Press, Cambridge
2. Archer G, Godman EM (1961) The birds of British Somaliland and the Gulf of Aden, vol 3–4. Oliver & Boyd, London
3. Ash JS (1980) Migrational status of Palearctic birds in Ethiopia. In: Proc 4th Pan-African Ornithol Congress. Seychelles, pp 199–208
4. Ash JS (1981) Bird-ringing results and ringed bird recoveries in Ethiopia. Scopus 5:85–101
5. Ash JS (1994) Weights of migrant Palearctic Sylvia warblers in Ethiopia. Scopus 17:119–123