1. Standard Methods for the Examination of Water and Wastewater,1989
2. Standard Test Method for Cyanides in Waters, D 2036-97;American Society for Testing Material (ASTM),1997
3. German Standard Methods for the Examination of Water, Wastewater and Sludge, Anions (Group D), DIN 38405, Parts 13 and 14, VCH, Weinheim, 1988.
4. Rapid Distillationless "Free Cyanide" Determination by a Flow Injection Ligand Exchange Method