Changes

<ref name="Callister">Callister Jr., William D. ''Materials Science and Engineering: An Introduction, 6e''. Von Hoffman Press: 2003.</ref>

<ref name="Callister">Callister Jr., William D. ''Materials Science and Engineering: An Introduction, 6e''. Von Hoffman Press: 2003.</ref>

]].<ref name="Atkins">Atkins, Peter and Julio de Paula. ''Physical Chemistry Volume 1, 8e.'' Oxford University Press: 2006.</ref>

<ref name="Atkins">Atkins, Peter and Julio de Paula. ''Physical Chemistry Volume 1, 8e.'' Oxford University Press: 2006.</ref>

<ref name="mcmurry">McMurry, John. ''Organic Chemistry, 6e''. Brooks/Cole: 2004.</ref>

<ref name="mcmurry">McMurry, John. ''Organic Chemistry, 6e''. Brooks/Cole: 2004.</ref>