1. Japanese Metallurgy—Part 1, Gold and Silver and their alloys;Gowland;Journal of the Society of Chemical Industry,1896
2. W. A. Oddy, unpublished analyses.
3. Ancient methods of gilding silver—examples from the old and new world;Lechtman,1971
4. Native copper, silver and gold;Patterson;American Antiquity,1971
5. A Short History of Technology;Derry,1960