1. Allen HE, Garrison AW, Luther GW III (1998) Metals in surface waters. Ann Arbor Press, Michigan
2. American Public Health Association (APHA), American Water Works Association, Water Pollution Control Federation, Water Environment Federation (2005) Standard methods for the examination of water and wastewater, 21st edn. Washington, DC
3. Arkansas Geological Survey (2014) Geology. Arkansas.gov.
http://www.geology.ar.gov/geology/general_geology.htm
. Accessed 1 November 2014
4. Blaustein AR (1994) Chicken little or Nero’s fiddle? A perspective on declining amphibian populations. Herpetologica 1994:85–97
5. Dodson SI (2005) Introduction to limnology. McGraw Hill, New York