Gmelin, J.F. (1789). Aves Anseres. Tome I. Pars II. <em>In: Gmelin J.F. (Ed.) Caroli a Linnaei Systema Naturae per Regna Tria Naturae.</em> 1(2): 501-1032., available online athttps://www.biodiversitylibrary.org/page/25749876 page(s): 564 [details]
original descriptionGmelin, J.F. (1789). Aves Anseres. Tome I. Pars II. <em>In: Gmelin J.F. (Ed.) Caroli a Linnaei Systema Naturae per Regna Tria Naturae.</em> 1(2): 501-1032., available online athttps://www.biodiversitylibrary.org/page/25749876 page(s): 564 [details]