1. A Study on some of the Chemical Methods for Determination of Phosphorus in Egyptian Soils;Abdel Bar,1953
2. A comparison of various laboratory methods for determining the phosphorus condition in soils;anderson;Acta Agric. Scand.,1962
3. Determination of water-soluble soil phosphate;Bingham;Calif. Agric.,1949
4. Recent Work on the chemical determination of readily soluble phosphorus in soils;Brind;Soils Fert.,1950
5. Physiologyof Fungi;Cochrane,1958