Roofarend: Verskil tussen weergawes

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fixing doi from hijacked website, see here
Lyn 50:
* Clark, W. S. (1992): ''The taxonomy of Steppe and Tawny Eagles, with criteria for separation of museum specimens and live eagles''. ''Bulletin of the British Ornithologists' Club'' '''112''': p. 150–157.
* Olson, Storrs L. (1994): ''Cranial osteology of Tawny and Steppe Eagles Aquila rapax and A. nipalensis. Bulletin of the British Ornithologists' Club'' '''114''': p. 264–267.
* Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. (2002): ''Taxonomic recommendations for European birds. (Ibis)'' '''144'''(1): p. 153–159, [http://www.blackwell-synergy.com/doi/pdf.org/10.1046/j.0019-1019.2001.00026.x in PDF-formaat]
 
[[Kategorie:Roofvoëls]]