Reference
Efraín C. Hernández, Guillermo Delgado, José Carrillo, Manuel Nogales, Vicente Quilis (1991): A preliminary census and notes on the distribution of the Barbary Falcon (Falco pelegrinoides Temminck, 1829) in the Canary Islands – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 42: 27 - 34.