Book: Frank, Stuart M. 2012 Ingenious Contrivances, Curiously Carved: Scrimshaw in the New Bedford Whaling Museum.
• See p. 184, Fig. 10:9.Book: Rogers, Gay Ann. 1983 An Illustrated History of Needlework Tools.
• Similar sheath pictured pg 199, Plate 170Book: Rogers, Gay Ann. 1983 An Illustrated History of Needlework Tools.
• Discussed on pg 201Other: Killian, Jackie. Kay Hawthorne Collection of Needlework Tools.