1. Agricultural Statistics, 1986. United States Department of Agriculture, National Agricultural Statistics Board, U.S. Government Printing Office. Washington, DC.
2. Chromatographic analysis of 18:1 isomers in blended feed-grade fats used in poultry diets;Al-Athari;Poultry Sci.,1988
3. Official Methods of Analysis,1984
4. Blake, J. P., 1986. Methodology for Evaluating the Digestibility and Metabolizable Energy of Poultry Feedstuffs. Ph.D. dissertation. Virginia Polytechnic Institute and State University, Blacksburg, VA.
5. Restaurant grease: how much is out there?;Burton;Render,1989