http://www.du.edu/~jcalvert/phys/boron.htm

Boron. 2004. 4/17/05. <http://www.scescape.net/~woods/elements/boron.html>

http://pearl1.lanl.gov/periodic/elements/5.html

Winter, Mark. Boron. 2005.  The University of Sheffield and Web Elements Ltd, UK. 4/18/05  <http://www.webelements.com/webelements/elements/text/B/key.html>

http://www.chemicalelements.com/elements/b.html

http://education.jlab.org/itselemental/ele005.html