Retrieved 9 September 2014. "Characterizing the Elements". LosAlamosNationalLaboratory. Archived from the original on 18 మార్చి 2015. Retrieved 4 March
Source Book in Chemistry 1400–1900 (New York: McGraw Hill, 1952) LosAlamosNationalLaboratory – Phosphorus Archived 2004-06-11 at the Wayback Machine WebElements