↑ ۱٫۰۱٫۱Lide, D. R., ed. (2003). CRC Handbook of Chemistry and Physics (84th ed.). Boca Raton (FL): CRC Press. ISBN0-8493-0484-9.
↑ ۲٫۰۲٫۱Fournier, Jean-Marc (1976). "Bonding and the electronic structure of the actinide metals". Journal of Physics and Chemistry of Solids. 37 (2): 235–244. doi:10.1016/0022-3697(76)90167-0.
↑J.A. Dean, ed. (1999). Lange's Handbook of Chemistry (15 ed.). McGraw-Hill. Section 4; Table 4.5, Electronegativities of the Elements.