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: McGrew, John R. 2004 Manufacturers' Marks on American Coin Silver. 176.
• Information on Angel Jacobs with example marks, p. 70Book: Goldsborough, Jennifer Faulds & Harper, Ann Boyce. 1975 Eighteenth and Nineteenth Century Maryland Silver in the Collection of the Baltimore Museum of Art. 204 p.
• Information on Abel Jacobs, p. 186