1. H.O. Buckman, N.C. Brady, The Nature and Properties of Soils, 7th ed, Chapter 16, Macmilan, New York, 1969
2. A.D. Eaton, L.S. Clescheri, A.E. Greenberg, Standard Methods for the Examination of Water and Wastewater, 16th ed., American Public Health Association, New York, 1978
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