Geronticus: Malsamoj inter versioj

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Linio 42:
* Brookes, Ian (ed.) (2006): ''The Chambers Dictionary'' (9a eld.). Chambers, Edinburgh. ISBN 0-550-10185-3
* |del Hoyo, Josep; Elliott, Andrew & Sargatal, Jordi (eds.) (1992): ''[[Handbook of Birds of the World]]'' (Vol. 1: Ostrich to Ducks). Lynx Edicions, Barcelona. ISBN 84-87334-10-5
* Mlíkovský, Jirí (2002): ''Cenozoic Birds of the World'' (Part 1: Europe). Ninox Press, Prague. {{Listed Invalid ISBN|80-901105-3-8}} [http://www.nm.cz/download/JML-18-2002-CBE.pdf PDF plena teksto]<!-- This should be treated with extreme caution as regards merging of species. Splits are usually good though. See also critical review in Auk121:623-627 here http://www.findarticles.com/p/articles/mi_qa3793/is_200404/ai_n9396879 -->
* Sinclair, Ian; Hockey, Phil & Tarboton, Warwick R. (2002): ''SASOL Birds of Southern Africa''. Struik, Cape Town ISBN 1-86872-721-1
* Snow, David W. & Perrins, Christopher M. (eds.) (1998): ''The Birds of the Western Palearctic'' (concise ed.). Oxford University Press. ISBN 0-19-854099-X