1. 40 CFR sec 220-229, n.d. Environment Protection Agency, USA
2. 40 CFR sec 261.21 n.d. (Electronic Code of Federal Regulations, U.S. EPA Title 40 sub part C, sec 261.21, Characteristic of Hazardous Waste, Characteristic of Ignitibility)
3. 40 CFR sec 261.22 n.d. (Electronic Code of Federal Regulations, U.S. EPA Title 40 sub part C, sec 261.22, Characteristic of Hazardous Waste, Characteristic of Corrosivity)
4. 40 CFR sec 261.23 n.d. (Electronic Code of Federal Regulations, U.S. EPA Title 40 sub part C, sec 261.23, Characteristic of Hazardous Waste, Characteristic of Reactivity)
5. 40 CFR sec 261.24 n.d.(Electronic Code of Federal Regulations, U.S. EPA Title 40 sub part C, sec 261.24, Characteristic of Hazardous Waste, Characteristic of Toxic)