1. L.W. Canter, Nitrates in Groundwater, CRC Press, Boca Raton, 1996.
2. European Communities (Drinking Water) (No. 2), Regulations 2007. Statutory instruments.
3. Health Canada, Guidelines for Canadian Drinking Water Quality, sixth ed. Ministry of Health, Ottawa, 1996.
4. Review of natural and artificial denitrification of groundwater