Beaman, M. & S. Madge (1998): The Handbook of Bird Identification for Europe and the Western Palearctic.
Clark, W.S. (1999): A Field Guide to the Raptors of Europe, The Middle East and North Africa.
Cramp, S. & K.E.L. Simmons (1980): Handbook of the Birds of Europe, the Middle East and North Africa. The Birds of the Western Palearctic. Vol. 2: Hawks to Bustards.
Ferguson-Lees, J. & D.A. Christie (2001): Raptors of the World.
Forsman, D. (1999): The Raptors of Europe and The Middle East. A Handbook of Field Identification.
Harris, A., L. Tucker, & K. Vinicombe (1989): The Macmillan Field Guide to Bird Identification.
Harris, A., H. Shirihai & D. Christie (1996): The Macmillan Birder’s Guide to European and Middle Eastern Birds.
Hoyo, J. del, A. Elliott & J. Sargatal (1992): Handbook of the Birds of the World. Vol. 2: New World Vultures to Guineafowl.
Jonsson, L. (1992): Birds of Europe with North Africa and the Middle East.
Svensson, L., P. Grant, K. Mullarney & D. Zetterström (1999): Birds of Europe.