(en) Ericson, P.et al. 2005. Inter-generic relationships of the crows, jays, magpies and allied groups (Aves: Corvidae) based on nucleotide sequence data. Journal of Avian Biology 36: 222-234. PDF fulltext. Gearchiveerd op 27 mei 2023.
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(en) Ericson, P.et al. 2005. Inter-generic relationships of the crows, jays, magpies and allied groups (Aves: Corvidae) based on nucleotide sequence data. Journal of Avian Biology 36: 222-234. PDF fulltext. Gearchiveerd op 27 mei 2023.