1. DNA sequence support for a close phylogenetic relationship between some storks and New World vultures.
2. Raptor migration along the Mesoamerican land corridor.;Bildstein K. L.;Hawkwatching in the Americas,2001
3. Die mauser der schwungfedern beim Weisstork Ciconia ciconia.;Bloesch M.;Ornithological Beob,1977
4. Molt and sequence of plumages of Golden Eagles and a technique for in-hand ageing.;Bloom P. H.;North American Bird Bander,2001
5. Brown L. 1976. Classification and distribution. Birds of prey their biology and ecology. Hamlyn Publishing Group Limited. London Great Britain.