References (Click the next to a value above to see complete citation information for that entry)
Albright, Thomas A., and Jeremy K. Burdett. Problems in Molecular Orbital Theory. New York: Oxford University Press, 1992.
Allen, Leland C. "Electronegativity Is the Average One-Electron Energy of
the Valence-Shell Electrons in Ground-State Free Atoms." Journal of the American Chemical Society, volume 111, number 25, 1989, pp. 9003–9014. doi:10.1021/ja00207a003
Huheey, James E., Ellen A. Keiter, and Richard L Keiter. Inorganic Chemistry: Principles of Structure and Reactivity, 4th edition. New York: HarperCollins College Publishers, 1993.