1. H.O. Buckman, N.C. Brady, The Nature and Properties of Soils, 7th Edition, Macmillan, New York, 1969 (Chapter 16).
2. A.D. Eaton, L.S. Clescheri, A.E. Greenberg, Standard Methods for the Examination of Water and Wastewater, 19th Edition, American Public Health Association, Washington, 1995.
3. Nitrates, Nitrites, and Nitrosamines
4. The toxicology of nitrate, nitrite andn-nitroso compounds
5. Determination of Nitrate and Nitrite in Blood and Urine by Chemiluminescence