Birds of the Horn of Africa: Ethiopia, Eritrea, Djibouti, Somalia and Socotra. Nigel Redman, Terry Stevenson and John Fanshawe with contributions from Nik Borrow and Brian Finch. Illustrated by John Gale and Brian Small. 2009.
Birds of Ethiopia and Eritrea: an atlas of distribution. John Ash and John Atkins. With contributions from Caroline Ash, Sue Edward, Chris Hillman, Geoffrey Last and John Miskell. Photographs by Hadoram Shirihai. 2009. Christopher Helm.