1. Assessment of alternative management techniques of tank bottom petroleum sludge in Oman
2. American standard for testing and materials (ASTM – D1266-98) (2001). Standard Test Method for Sulfur in Petroleum Products (Lamb method).
3. American standard for testing and materials (ASTM – D1298 – 12b). Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method.
4. American standard Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer Method).
5. American standard for testing and materials (ASTM – D-3230-IP265). Standard Test Method for Salts in Petroleum Products.