1. The Nutrient Requirements of Farm Livestock, No. 2. Ruminants;Agricultural Research Council (ARC),1980
2. The Nutrient Requirements of Ruminant Livestock;Agricultural Research Council (ARC),1984
3. Feed Evaluation and Protein Requirement Systems for Ruminants;Alderman,1987
4. Official Methods of Analysis;Association of Official Analytical Chemists (AOAC),1984
5. Experimental Designs;Cochran,1962