Book: Fennimore, Donald L. 1996 Metalwork in Early America: Copper and Its Alloys from the Winterthur Collection.
• Published: p. 322, cat.no.213Book: Diderot, Denis & D'Alembert, Jean. 1751 Encyclopedie: Dictionnaire raisonne des sciences, des arts et des metiers.
• See Perruquier Barbier Plate II for an illustration of a sponge box