1. ASTM D6270-98. 1998. “Standard Practice for the Use of Scrap Tires in Civil Engineering Applications”. West Conshohocken, Pennsylvania: American Society for Testing and Materials.
2. ASTM D6700-01. 2001. “Standard Practice for Use of Scrap Tire-Derived Fuel”. West Conshohocken, Pennsylvania: American Society for Testing and Materials.