Description: Australian Shelduck Tadorna tadornoides at the Wildfowl and Wetlands Trust, Slimbridge, Gloucestershire, England. Photographed by Adrian Pingstone in June 2006 and placed in the public domain. Date: 3 May 2008 (original upload date). Source: No machine-readable source provided. Own work assumed (based on copyright claims). Author: No machine-readable author provided. Arpingstone assumed (based on copyright claims).
Sir William Jardine's illustrations of the duck tribe..Dumfries, N.B. :Privately printed at the expense of the author,[1840?].biodiversitylibrary.org/page/36001912
A monograph on the anatidae, or duck tribe /.London :Longman, Orme, Brown, Green, & Longman ... and Eddowes, Shrewsbury,1838..biodiversitylibrary.org/page/36002239