1. Daintith J (1966) Dictionary of chemistry, 6th edn. Elsevier
2. Winter MJ (2016) Chemical bonding. Oxford University Press
3. Atkins PW, Friedman R (2011) Molecular quantum mechanics, 5th edn
4. Miessler GL, Tarr DA, Kauffman GB (2000) Inorganic chemistry, 2nd edn, vol 77, no 2
5. Atkins BPW, Child MS, Phillips CSG (2006) Tables for group theory