books regarding porcelain and pottery back stampsps
SMITHSONIAN INFORMATION
Porcelain and Pottery Marks: A Selected Bibliography / English language
www.si.edu/Encyclopedia_SI/nmah/potmarks.htm
E books
CHAFFERS, William (1866), Marks and monograms on pottery and porcelain: with historical notices of each Manufactury, J. Davy & Sons London / Englisch language
www.ceramic-link.de/icd/pages/books/ebooks/William_Chaffers_1866.html
HOPPER, William (1894), A manual of marks on pottery and porcelain; a dictionary of easy reference , London, Macmillan and co./ Englisch language
www.ceramic-link.de/icd/pages/books/ebooks/William_Hopper_1894.html
International Ceramics Directory – Tobias Spitzer 1999-2022