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Barker, F. Keith; Barrowclough, George F. & Groth, Jeff G. 2002. A phylogenetic hypothesis for passerine birds: taxonomic and biogeographic implications of an analysis of nuclear DNA sequence data. Proceedings of the Royal Society B. 269: 295-308. doi:10.1098/rspb.2001.1883PDF fulltextArchived 2008-05-11 at the Wayback Machine
Barker, F. Keith; Barrowclough, George F. & Groth, Jeff G. 2002. A phylogenetic hypothesis for passerine birds: taxonomic and biogeographic implications of an analysis of nuclear DNA sequence data. Proceedings of the Royal Society B. 269: 295-308. doi:10.1098/rspb.2001.1883PDF fulltextArchived 2008-05-11 at the Wayback Machine