1. Association of Official Agricultural Chemists. Official and Tentative Methods of Analysis. 9th ed. Washington, D. C. (1960).
2. Photometric Analysis of Phosphate Bock;Barton;Anal. Chem.,1948
3. Livestock Poisoning by Oat Hay and Other Plants Containing Nitrate;Bradley,1940
4. Some Aspects of Nitrate Intoxication in Livestock;Case;J. Am. Vet. Med. Assoc.,1957
5. Comparison of Orange G Dye, Formal Titration, and Kjeldahl Methods for Milk Protein Determinations;Castillo;J. Dairy Sci.,1962