The birds of Africa,.
London,Published for the author by R.H. Porter (18 Princes Street, Cavendish Square, W.),1896-1912..
biodiversitylibrary.org/page/14034294
Description: English: Somali Sparrow (Passer castanopterus). Photograph of a specimen at Nairobi National Museum in Nairobi, Kenya. Date: 7 November 2013. Source: Own work. Author: DickDaniels (http://carolinabirds.org/).