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. PDF fulltextArkiverad 5 februari 2007 hämtat från the Wayback Machine.
uog.edu
Steadman, David William (1999): The Prehistory of Vertebrates, Especially Birds, on Tinian, Aguiguan, and Rota, Northern Mariana Islands. Micronesica31(2): 319-345. PDF fulltextArkiverad 5 juli 2004 hämtat från the Wayback Machine.
web.archive.org
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. PDF fulltextArkiverad 5 februari 2007 hämtat från the Wayback Machine.
Steadman, David William (1999): The Prehistory of Vertebrates, Especially Birds, on Tinian, Aguiguan, and Rota, Northern Mariana Islands. Micronesica31(2): 319-345. PDF fulltextArkiverad 5 juli 2004 hämtat från the Wayback Machine.