REDMAN, Nigel; STEVENSON, Terry; FANSHAWE, John. Birds of the Horn of Africa: Ethiopia, Eritrea, Djibouti, Somalia, and Socotra – Revised and Expanded Edition. Princeton, New Jersey : Princeton University Press, 2016. [Cit. 2018-12-13]. Dostupné online.ISBN 978-0-691-17289-7. S. 44. (po anglicky)
