1. Bird, E. W., & Breazeale, D. F. (1931). Chemistry of butter and butter making I. A comparison of four methods for the analysis of butter with an explanation of a discrepancy found to exist in the fat determinations. Research Bulletin No. 144. Ames, Iowa: Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts.
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. Direct determination of fat using ISO/CD17189.2—an international collaborative study of spreadable fats and a meta-analysis;Evers;International Dairy Journal,2001
5. Routine methods for the determination of solids-not-fat, moisture and fat (by difference) in butter—robustness, bias and precision;Evers;International Dairy Journal,2001