Bradley C. Livezey, 1986. A phylogenetic analysis of recent anseriform genera using morphological characters. The Auk 103(4):737–754. Full text. Gearchiveerd op 16 januari 2022.
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Bradley C. Livezey, 1986. A phylogenetic analysis of recent anseriform genera using morphological characters. The Auk 103(4):737–754. Full text. Gearchiveerd op 16 januari 2022.