1. NRC Tantalum, NRC Inc., 1969.
2. Metals Handbook, 9th Edition, Vol. 2, “Properties and Selection—Non-Ferrous Alloys and Pure Metals,” American Society for Metals, 1979.
3. NRC Inc., data.
4. Manufactured by NRC Inc.
5. F.J. Hunkeler, Properties of Tantalum for Applications in the Chemical Process Industry, NRC Inc., 1983.