1. Standard Methods for the Examination of Water and Wastewater;American Public Health Association,1971
2. The determination of part-per-billion levels of citric and nitrilotriacetic acids in tap water and sewage effluent;Aue;J. Chromatogr.,1972
3. Treatment of waste-containing NTA in a trickling filter;Cleasby;J. Wat. Pollut. Control Fed.,1974
4. National interim primary drinking water regulations;Environmental Protection Agency;Fedl Reg.,1975
5. Methods for Chemical Analysis of Water and Wastes;Environmental Protection Agency;EPA 16020-07/71,1971