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1 2 3 4 5 Johnson Kevin P. & Sorenson Michael D. (1999): Phylogeny and biogeography of dabbling ducks (genus Anas): a comparison of molecular and morphological evidence. Auk116(3): 792–805. Toàn văn PDF
1 2 Livezey Bradley C. (1986): A phylogenetic analysis of recent anseriform genera using morphological characters. Auk103(4): 737-754. Toàn văn PDFToàn văn DjVu
↑ Sraml M.; Christidis L.; Easteal S.; Horn P. & Collet C. (1996): Molecular Relationships Within Australasian Waterfowl (Anseriformes). Australian Journal of Zoology 44(1): 47-58. doi:10.1071/ZO9960047 (Tóm tắt HTML)
↑ Steadman David William (1999): The Prehistory of Vertebrates, Especially Birds, on Tinian, Aguiguan, and Rota, Northern Mariana Islands. Micronesica 31(2): 319-345. Toàn văn PDF
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