1. Asphalts and Allied Substances;Abraham,1945
2. Hydroprocessing of Heavy Oils and Residua;Ancheyta,2007
3. ASTM D4. Standard Test Method for Bitumen Content. Annual Book of Standards. American Society for Testing and Materials, West Conshohocken, Pennsylvania.
4. ASTM D97. Standard Test Method for Pour Point of Petroleum Products. Annual Book of Standards. American Society for Testing and Materials, West Conshohocken, Pennsylvania.
5. ASTM D287. Standard Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer Method). Annual Book of Standards. American Society for Testing and Materials, West Conshohocken, Pennsylvania.