Kamienski et al. "Lithium and lithium compounds". Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. Published online 2004. doi:10.1002/0471238961.1209200811011309.a01.pub2
Alberts, Bruce; Alexander Johnson; Julian Lewis; Martin Raff; Keith Roberts; Peter Walter (2002). "The Chemical Components of a Cell". Molecular Biology of the Cell. Garland Science.
pdrhealth.com
"Boron". PDRhealth. Archived from the original on October 11, 2007. Retrieved 2008-09-18.