1. “Standard Methods for the Examination of Water and Wastewater,”;American Public Health Association, American Water Works Association and Water Pollution Control Federation,1976
2. American Society for Testing and Materials (ASTM) (1987a). Annu. Book ASTM Stand. No. D1452 (04.08), pp. 270–272.
3. American Society for Testing and Materials (ASTM) (1987b). Annu. Book ASTM Stand. No. D1587 (04.08), pp. 302–305.
4. American Society for Testing and Materials (ASTM) (1987c). Annu. Book ASTM Stand. No. D4220 (04.08), pp. 719–728.