By: Swann, H. Kirke (Harry Kirke),

Type: Article

In: A synoptical list of the Accipitres (diurnal birds of prey) : comprising species and subspecies, described up to 1919, with their characters and distribution

Volume: 2

Date: 1919-11-07

Page Range: 39--75

Publication info: London, J. Wheldon, 1920 [i.e. 1919-1920]