Clair N. Sawyer; Perry L. McCarty; Gene F. Parkin (2003). Chemistry for Environmental Engineering and Science (ed. 5th). New York: McGraw-Hill. ISBN0-07-248066-1.
Lenore S. Clescerl; Arnold E. Greenberg; Andrew D. Eaton. Standard Methods for Examination of Water & Wastewater (ed. 20th). Washington, DC: American Public Health Association. ISBN0-87553-235-7.
