Article: Schkolne, Myrna. 2011 A Pearlware Puzzle: Walton Figures and Their Look-Alikes. American Ceramic Circle Journal. 57-77.
• Comparison of Walton and unmarked marked, generally similar, sheep with discussion: p. 57, fig. 2, c. 1806-35Book: Godden, Geoffrey A. 1966 An Illustrated Encyclopedia of British Pottery and Porcelain.
• Somewhat similar pair of sheep bocages, marked "Salt" within molded scroll: p. 289, no. 507, c. 1825