1. American Society of Civil Engineers, Sanitary Engineering Division . 1959 . Sanitary landfill. Manual of EngineeringPractice No. 39, 61 pp.
2. DETERMINATION OF TOTAL, ORGANIC, AND AVAILABLE FORMS OF PHOSPHORUS IN SOILS
3. California Water Pollution Control Board . 1954 . Report on the investigation of leaching a sanitary landfill. State Water Pollution Control Board Pub. 10, 92 pp.
4. T. R. Camp, 1963 . Water and its impurities . Reinhold Publishing Corp., New York, pp. 245 -247 .