1. Sludge treatment, utilization and disposal;Dick R. I;J. Water Pollut. Control Fed.,1975
2. Effect of Sewage Sludge on Some Soil Physical Properties
3. Metcalf & Eddy Inc. Wastewater Engineering: Collection Treatment Disposal McGraw-Hill New York N. Y.
4. Stone R. Disposal of sewage sludge into a sanitary landfill. U. S. EPA Report EPA SW-71d 1974.
5. Walker J. M. Sewage Sludges-Management Aspects for Land Application. Paper presented at North Central Regional Workshop on Educational Needs Associated with Utilization of Wastewater Treatment Products on Land Kellog Center Michigan State University 1974.