Book: Belden, Louise C. 1980 Marks of American Silversmiths in the Ineson-Bissell Collection. 506 p.
• An illustrated glossary of spoon terms, pp. 467-488Book: Currier, Ernest M. 1938 Marks of Early American Silversmiths: With Notes on Silver, Spoon Types & List of New York City Silversmiths 1815-1841. 179 p.
• Information on seal-top and Apostle spoons, p. 165Book: Jackson, Charles James. English Goldsmiths and their Marks: A History of the Goldsmiths and Plate Workers of England, Scotland, and Ireland. 747 p.
• Example of mark and dating information, p. 332Book: Schroder, Timothy. 2009 British and Continental Gold and Silver in the Ashmolean Museum. 2.
• See spoons, Vol. 2, pp. 828-58.