Hess, Catherine (2003), Italian Ceramics: Catalogue of the J. Paul Getty Museum Collections, pp 230, 237 note 7, 2003, Getty Publications, ISBN0892366702, 9780892366705, google books
Inorganic Chemistry, by A. F. Holleman, Egon Wiberg, Nils Wiberg, Editor Nils Wiberg, 2001, Academic Press, ISBN, 0123526515, 9780123526519, google books; see also Singer and Singer, pp. 104-1102