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↑Cracraft, Joel (2014). "Avian higher-level relationships and classification: passeriformes". Dickinson, E.C.; Christidis, L. (Ed.). The Howard & Moore Complete Checklist of the Birds of the World. Volume 2: Passerines (4.4yer=Eastbourne, UK bas.). Aves Press. ss.xvii-xxxiii [xxiv]. ISBN978-0-9568611-2-2.