1. Appelo CAJ, Postma D (2005) Geochemistry, groundwater and pollution. Balkema, Rotterdam, 536 pp
2. Back W (1960) Origin of hydrochemical facies of ground water in the Atlantic coastal plain. 21st Int. Geol. Cong. Rep., pt. 1, Copenhagen, 1960, pp 87–95
3. Beusen AHW et al (2008) Considerations of groundwater quality characterisation for the water framework directive 500003006 (in Dutch). Planbureau voor de Leefomgeving (PBL), Bilthoven, The Netherlands. http://www.pbl.nl/nl/publicaties/2008/Basisdocument-karakterisering-grondwaterkwaliteit-voor-de-Kaderrichtlijn-Water.html . Cited 27 April 2010
4. Brooks D, Cech I (1979) Nitrates and bacterial distribution in rural domestic water supplies. Water Res 13(1):33–41
5. Cech I, Lemma M, Kreitler CW, Prichard HM (1988) Radium and radon in water supplies from the Texas Gulf Coastal aquifer. Water Res 22(1):109–121