Carboneras, C.; Kirwan, G.M. Del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David; De Juana, Eduardo , 编. Hardhead: Aythya australis. Birds of the World (Cornell Lab of Ornithology). 2020 [9 February 2021]. doi:10.2173/bow.wheduc1.01.
doi.org
Carboneras, C.; Kirwan, G.M. Del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David; De Juana, Eduardo , 编. Hardhead: Aythya australis. Birds of the World (Cornell Lab of Ornithology). 2020 [9 February 2021]. doi:10.2173/bow.wheduc1.01.