1. Birds of Prey in Europe;Bijleveld,1974
2. A radiotracking study of an adult Cape griffon vulture Gyps coprotheres in the south-western Cape Province;Boshoff;S. Afr. J. Wildl. Res.,1984
3. The distribution and status of some eagles in the Cape Province;Boshoff;Ann. Cape Prov. Mus. (Nat. Hist.),1980
4. Historical atlas of the diurnal raptors of the Cape Province (Aves: Falconiformes);Boshoff;Ann. Cape Prov. Mus. (Nat. Hist.),1983
5. South African Red Data Book—Birds;Brooke;S. Afr. Natn. Sci. Progr. Rep.,1984