1. American Public Health Association, American Water Works, Association, and Water Pollution Control Federation, “Standard Methods for the Examination of Water and Waste Water”, (1976) 532.
2. Federal Register, April 1977.
3. Waters Associates, “Waters Associates Energy Project Gradient Elution Liquid Chromatography Technique for Airborne or Water Soluble Aromatic Hydrocarbons”, WAEP-130.