^
abcdefghijGarrigues, Richard & Dean, Robert (2007). Birds of Costa Rica. Zona Tropical Publication.
ISBN978-0-8014-4587-3.
^Zimmerman, Dale A.; Turner, Donald A.; Pearson, David J. (1999). Birds of Kenya and Northern Tanzania. Princeton University Press.
ISBN0-691-01022-6.
^
abcdefgDunn, Jon L. & Alderfer, Jonathan (2006). National Geographic Guide to the Birds of North America. National Geographic Society.
ISBN1-4262-0072-2.