1. Roman brass-making in Britain;Bayley;Historical Metallurgy,1984
2. The production of brass in antiquity with particular reference to Roman Britain;Bayley,1998
3. Tutenag and Paktong;Bonnin,1924
4. Two thousand years of coinage in China: an analytical survey;Bowman;Historical Metallurgy,1989
5. The Chinese cash: composition and production;Cowell,1993