1. Handbook of Industrial Chemistry and Biotechnology, Springer, Boston, 2012, Ch. 22, p. 875–937.
2. First Steps: Synthetic Ammonia in the United States
3. Catalytic Ammonia Synthesis, Springer, Boston, 1991, Ch. 7, p. 253–282.
4. Encyclopedia of Chemical Technology, John Wiley & Sons, 2004, Ch. 17, p.293.
5. L. Casale, CA 230,616, Canada, 1923.