Black East Indian and Rouen Ducks, illustration by Harrison Weir in: William Wingfield, George William Johnson, Harrison Weir (illustrator) (1853). <a rel="nofollow" class="external text" href="https://archive.org/stream/b28059372#page/296"><i>The Poultry Book: comprising the characteristics, management, breeding and medical treatment of Poultry</i></a>. London: Wm. S. Orr and Co., page 289.
<a href="https://en.wikipedia.org/wiki/Harrison_Weir" class="extiw" title="w:Harrison Weir">Harrison Weir</a>
William Wingfield, George William Johnson, Harrison Weir (illustrator) (1853). <a rel="nofollow" class="external text" href="https://archive.org/stream/b28059372#page/296"><i>The Poultry Book: comprising the characteristics, management, breeding and medical treatment of Poultry</i></a>. London: Wm. S. Orr and Co.