1. The significance of the morphological variation in the finch species on Gough, Inaccessible and Nightingale Islands, South Atlantic Ocean;Abbott;J. Zool. Lond.,1978
2. Ecology and pathogenicity of avian malaria and pox;Atkinson,2009
3. Historic extinction and decline;Banko,2009
4. Ben-Dov, Y., Hodgson, C.J., 1997. Soft Scale Insects: Their Biology, Natural Enemies and Control. World Crop Pests, Vol. 7A. Elsevier, Amsterdam.
5. Threatened Birds of the World 2008;BirdLife International,2008