1. Official Methods of Analysis;AOAC,1975
2. Levels of phosphate esters in spirodella;Bieleski;Plant Physiol.,1968
3. Methods of Analysis for Soils, Plants and Water;Chapman,1961
4. The phytic acid content of some poultry feedingstuffs;Common;The Analyst,1940
5. Inositol Phosphates: Their Chemistry, Biochemistry and Physiology;Cosgrove,1980