Book: Rickard, Jonathan. 2006 Mocha and Related Dipped Wares, 1770-1939.
• Mug bearing displaying similar approach to engine-turing a double-layer of slip: p. 42, fig. 56, with pink luster, c. 1800Article: Rickard, Jonathan & Carpentier, Donald. 2004 "The Little Engine that Could: Adaptation of the Engine-Turning Lathe in the Pottery Industry". Ceramics in America. 78-99.
• Engine-turning, rouletting and history for dipped and other English ceramics: whole article.