Sources
1) "Phosphorus." Minerals Education Coalition. N.p., n.d. Web. 15 Apr. 2014. http://www.mineralseducationcoalition.org/elements/phosphorus
2) "Phosphorus." - Element information, properties and uses. Royal Society of Chemistry , n.d. Web. 14 Apr. 2014. http://www.rsc.org/periodic-table/element/15/phosphorus.
3) "ChemEd DL Application: Periodic Table Live! (Development Site)." ChemEd DL Application: Periodic Table Live! (Development Site). N.p., n.d. Web. 21 Apr. 2014. http://www.chemeddl.org/resources/ptl/index.php
4) Gagnon, Steve. "The Element Phosphorus." It's Elemental -. Jefferson Lab, n.d. Web. 21 Apr. 2014. http://education.jlab.org/itselemental/ele015.html
5) "Phosphate Overview." Phosphate Overview. PotashCorp, n.d. Web. 21 Apr. 2014. http://www.potashcorp.com/overview/nutrients/phosphate/overview/world-phosphate-rock-profile.
6) Sander, Donald , and Edwin Penas. "Phosphorus." Fertility Principles. N.p., n.d. Web. 22 Apr. 2014. <http://www.ianrpubs.unl.edu/epublic/live/ec155/build/ec155-2.pdf>.
2) "Phosphorus." - Element information, properties and uses. Royal Society of Chemistry , n.d. Web. 14 Apr. 2014. http://www.rsc.org/periodic-table/element/15/phosphorus.
3) "ChemEd DL Application: Periodic Table Live! (Development Site)." ChemEd DL Application: Periodic Table Live! (Development Site). N.p., n.d. Web. 21 Apr. 2014. http://www.chemeddl.org/resources/ptl/index.php
4) Gagnon, Steve. "The Element Phosphorus." It's Elemental -. Jefferson Lab, n.d. Web. 21 Apr. 2014. http://education.jlab.org/itselemental/ele015.html
5) "Phosphate Overview." Phosphate Overview. PotashCorp, n.d. Web. 21 Apr. 2014. http://www.potashcorp.com/overview/nutrients/phosphate/overview/world-phosphate-rock-profile.
6) Sander, Donald , and Edwin Penas. "Phosphorus." Fertility Principles. N.p., n.d. Web. 22 Apr. 2014. <http://www.ianrpubs.unl.edu/epublic/live/ec155/build/ec155-2.pdf>.