Cracraft, J., Barker, F.K. & Cibois, A., 2003. Avian Higher-level Phylogenetics and the Howard and Moore Checklist of Birds. In E.C. Dickinson (ed.), The Howard and Moore Complete Checklist of the Birds of the World. 3rd Edition. Christopher Helm, London.: 16-21.
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Cracraft, J., 2013. Avian Higher-level Relationships and Classification: Nonpasseriforms. In E.C. Dickinson & J.V. Remsen Jr. (eds.), The Howard and Moore Complete Checklist of the Birds of the World, 4th Edition. Aves Press, Eastbourne, U.K.: xxi-xliii.
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