Sangster, George; Collinson, J. Martin; Helbig, Andreas J.; Knox, Alan G.; Parkin, David T. (2005), "Taxonomic recommendations for British birds: third report", Ibis, 147 (4): 821–826, doi:10.1111/j.1474-919X.2005.00483.x, S2CID250043960
Szefer, Piotr; Falandysz, Jerzy (1987). "Trace metals in the soft tissues of scaup ducks (Aythya marila L.) wintering in Gdańsk bay, Baltic sea". Science of the Total Environment. 65: 203–213. Bibcode:1987ScTEn..65..203S. doi:10.1016/0048-9697(87)90173-2.
dto.com
"Greater Scaup". Discover the Outdoors. Retrieved 19 November 2011.
ducks.org
"Greater Scaup". Ducks Unlimited. Retrieved 1 November 2011.
"Waterfowl Hunting Management in North America". Scaup Population Estimates. U.S. Fish and Wildlife Service in collaboration with flyway and state waterfowl managers. 29 June 2010. Archived from the original on 16 October 2011. Retrieved 4 November 2011.
Szefer, Piotr; Falandysz, Jerzy (1987). "Trace metals in the soft tissues of scaup ducks (Aythya marila L.) wintering in Gdańsk bay, Baltic sea". Science of the Total Environment. 65: 203–213. Bibcode:1987ScTEn..65..203S. doi:10.1016/0048-9697(87)90173-2.
Sangster, George; Collinson, J. Martin; Helbig, Andreas J.; Knox, Alan G.; Parkin, David T. (2005), "Taxonomic recommendations for British birds: third report", Ibis, 147 (4): 821–826, doi:10.1111/j.1474-919X.2005.00483.x, S2CID250043960
state.mn.us
dnr.state.mn.us
"Bluebills". Minnesota Department of Natural Resources. Archived from the original on 20 December 2013. Retrieved 3 November 2011.
Alvarez, Rafael (1977). "A pleistocene avifauna from Jalisco, Mexico"(PDF). Contributions from the Museum of Paleontology, University of Michigan. 24 (19). University of Michigan: 214. Retrieved 9 March 2015.
unitedstatesfauna.com
"Greater Scaup". United States Fauna. Archived from the original on 21 October 2013. Retrieved 2 November 2011.
"Greater Scaup". Audubon. National Audubon Society. Archived from the original on 11 November 2010. Retrieved 26 October 2011.
"Greater Scaup". United States Fauna. Archived from the original on 21 October 2013. Retrieved 2 November 2011.
"Greater Scaup". National Biological Information Infrastructure. Archived from the original on 9 December 2011. Retrieved 8 November 2011.
"Waterfowl Hunting Management in North America". Scaup Population Estimates. U.S. Fish and Wildlife Service in collaboration with flyway and state waterfowl managers. 29 June 2010. Archived from the original on 16 October 2011. Retrieved 4 November 2011.