References
- A Manual of Porcelain Enameling pp. 87–88. by J. E. Hansen.
- The Making Shaping and Treating of Steel. pp. 1192, 1268, 1272, by J. M. Camp, and C. B. Francis.
- A text book of Medical Jurisprudence and Toxicology, 7th edition pp. 598–599, 781–782. by Jaising P. Modl