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2. Association of Official Agricultural Chemists, 1955. Official Methods of Analysis of the A.O.A.C., 8th ed., Washington, D.C.
3. Der Allgemein Nahrwert unserer gewohnlichsten Futtermittel der Huhner;Axelsson;Annalen der Landwirtschaftlichen Hochschule, Sweden,1937
4. Simple micro-determination of uric acid;Dubbs;J. Biol. Chem.,1956
5. Digestibility and production coefficients of poultry feeds;Fraps;Texas Agr. Exp. Sta. Bull.,1928