1. Notes on Philippine Birds
2. BARTH, E. K.1952. Breeding biology of the Rough-legged Buzzard. Papers onGame Research No. 8, p. 126. Finlands JaktvArdsstiftelse, Helsinki.Barth126Breeding biology of the Rough-legged Buzzard1952
3. BROWN, L.1955. Eagles. pp. 225-226. London.Brown225Eagles1955