1. AOAC International (1995). Method 938.06A. Official Methods of Analysis of AOAC International (16th ed.). Arlington, Virginia: AOAC International.
2. Evers, J. M., (1999). Determination of fat in butter—A review. IDF Bulletin No. 340, Brussels: International Dairy Federation.
3. Comparison of routine and reference methods for the determination of moisture, solids-not-fat and fat in butter—A pilot collaborative study;Evers;International Dairy Journal,1997
4. IDF (1977). International Standard 80. Butter—Determination of water, solids-non-fat and fat contents on the same test portion. Brussels: International Dairy Federation.
5. IDF (1987). International Standard 16C. Cream. Determination of fat content (Röse Gottlieb reference method). Brussels: International Dairy Federation.