Catalogue: Northeast Auctions, Portsmouth NH (auction catalogue).
• Smaller version (13 1/4") impressed "WEDGWOOD": August 1-3, 2008, lot 226Article: Magid, Barbara H. 2006 "Commemorative Wares in George Washington's Hometown". Ceramics in America. 2-39.
• Example possibly from same mold: p. 10, fig. XII, 1875, with impressed letters "XCD" after Antoine Houdon's sculpture.Book: Beddoe, Stella. 2015 A Potted History: Henry Willett's Ceramic Chronicle of Britain.
• Slightly smaller Wedgwood basalt version impressed "JBW / D": p. 98, no. 434, without indication of dating.