Book: Mountford, Arnold R. 1971 The Illustrated Guide to Staffordshire Salt-Glazed Stoneware.
• Similar examples and archeological evidence: p. 50, pl. no. 168.Book: Edwards, Diana & Hampson, Rodney. 2005 White Salt-glazed Stoneware of the British Isles.
• Two examples of Staffordshire white salt-glazed stoneware Westerwald-type mugs: fig.126, p. 164Book: Gaimster, David. 1997 German Stoneware 1200-1900: Archaeology and Cultural History.
• Similarly inspired mugs with different crowned "GR" seals: pp. 322-23, no. 179, c. 1770-80, Burslem, Staffordshire, noting Williamsburg collection example with 1786+ Great Seal instead of "GR."Book: Gaimster, David. 1997 German Stoneware 1200-1900: Archaeology and Cultural History.
• Similarly inspired mug with different crowned "GR" seal: pp. 323-24, no. 180, center, with no caption.Book: Henrywood, R. K. 1997 An Illustrated Guide to British Jugs.
• Jug in similar style with "GR" seal and scratch blue decoration: p. 16, pl. 23Book: Noel Hume, Ivor. 2001 If These Pots Could Talk: Collecting 200 Years of British Household Pottery.
• Jug, mugs, and chamberpots with similar style relief and scratch-blue ornament: pp. 208-9, figs. IX.37-39; the chamberpots excavated at Wetherburn's Tavern Williamsburg VA & also Alexandria VAManuscript: Findlen, Suzanne Rae. "Taste and Choice in Early Portsmouth New Hampshire as Seen Through Ceramic Archaeological Evidence, 1700-1800" (MA thesis).
• Pseudo scratch-blue mug with "GR" seal excavated Deer Tavern privy site, Strawbery Banke, NH: p. 101, no. 176 (A-1024 DS5.5.F110), 1750-65 context. (Misattributed to Germany)