12Tolkien,Tracy;Wilkinson,Henrietta(1997).A Collector's Guide to Costume Jewelry Key Styles and how to recognize them.Firefly Books.p.49.ISBN1552091562
↑Tolkien,Tracy;Wilkinson,Henrietta(1997).A Collector's Guide to Costume Jewelry Key Styles and how to recognize them.Firefly Books.p.47.ISBN1552091562