Barker, FK (2002). "A phylogenetic hypothesis for passerine birds; Taxonomic and biogeographic implications of an analysis of nuclear DNA sequence data". Proc. R. Soc. Lond. B. Cilt 269. s. 295–308. doi:10.1098/rspb.2001.1883. PMC1690884 $2. PMID11839199.
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Barker, FK (2002). "A phylogenetic hypothesis for passerine birds; Taxonomic and biogeographic implications of an analysis of nuclear DNA sequence data". Proc. R. Soc. Lond. B. Cilt 269. s. 295–308. doi:10.1098/rspb.2001.1883. PMC1690884 $2. PMID11839199.