Dunn, Jon L. and Alderfer, Jonathan (2006). National Geographic Guide to the Birds of North America. National Geographic Society. ISBN1-4262-0072-2.KB1 bakım: Birden fazla ad: yazar listesi (link)
Zimmerman, Dale A., Turner, Donald A., and Pearson, David J. (1999). Birds of Kenya and Northern Tanzania. Princeton University Press. ISBN0-691-01022-6.KB1 bakım: Birden fazla ad: yazar listesi (link)
Robert S. Ridgely and John A. Gwynne, Jr. (1989). Birds of Panama with Costa Rica, Nicaragua, and Honduras. Princeton University Press. ISBN0-691-08529-3.
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