1. Total Free Fatty Acid in Oil and Fat, AOCS Method Ca 5a-40;AOCS,2004
2. Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration, ASTM D664-11ae1;ASTM,2011
3. Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity), ASTM D445-15a;ASTM,2015
4. Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels, ASTM D2500-16b;ASTM,2016
5. Oil extracted from spent coffee grounds as a renewable source for fatty acid methyl ester manufacturing;Al-Hamamre;Fuel,2012