References (Click the 
next to a value above to see complete citation information for that entry)
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
Boyd, Russell J., and Kenneth E. Edgecombe. "Atomic and Group
Electronegativities from the Electron-Density Distributions of Molecules." Journal of the American Chemical Society, volume 110, number 13, 1988, pp 4182–4186. doi:10.1021/ja00221a014
