- ↑ (1996) , database, NODC Taxonomic Code
- ↑ 2.0 2.1 Dickinson, Edward C., ed. (2003) , The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition
- ↑ 3.0 3.1 American Ornithologists' Union (2000) Forty-second supplement to the American Ornithologists' Union check-list of North American birds, The Auk, vol. 117, no. 3
- ↑ Lee, Sang-im, Cynthia S. Parr, Youna Hwang, David P. Mindell, and Jae C. Choe (2003) Phylogeny of magpies (genus Pica) inferred from mtDNA data, Molecular Phylogenetics and Evolution, vol. 29, no. 2
- ↑ Clements, James F. (2007) , The Clements Checklist of Birds of the World, Sixth Edition
- ↑ (2007) , website, Zoonomen - Zoological Nomenclature Resource, 2007.03.27
- ↑ 7.0 7.1 Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (ed.) (2011). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 24 Septyembre 2012.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ ITIS: The Integrated Taxonomic Information System. Orrell T. (custodian), 26 Abril 2011
