1. N. N. Greenwood and A.Earnshaw , Chemistry of the Elements , Butterworth-Heinemann , 2nd edn, 1997
2. F. A. Cotton , G.Wilkinson , C. A.Murillo and M.Bochmann , Advanced Inorganic Chemistry , John Wiley & Sons , 6th edn, 1999
3. A. F. Holleman , N.Wiberg and B. J.Aylett , Inorganic Chemistry , Lehrbuch der Anorganischen Chemie, Academic Press , First Engl. Edn, Revised, 2001
4. N. N. Greenwood and A.Earnshaw , Chemistry of the Elements , Elsevier , 2nd edn, reprinted, 2010
5. H. A. Sober , Handbook of Biochemistry , The Chemical Rubber Co. , Cleveland, OH, USA , 1970