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the World. New Haven, Connecticut: Yale University Press. ISBN 978-0-300-05549-8. Clement, P.; Hathway, R. (2000). Helm Identification Guides: Thrushes...

birds of the world. New Haven, Connecticut: Yale University Press. ISBN 0-300-05549-8. Groth, Jeff (1998). "Molecular Phylogenetics of Finches and Sparrows:...

Birds. New Haven and London: Yale University Press. p. 228. ISBN 978-0-300-05549-8. Dietzen, Christian; Witt, Hans-Hinrich; Wink, Michael (2003). "The...