1. Standard methods for the examination of water and wastewater. American public health association (APHA);APHA,2005
2. Evaluation of chemical amendments to control phosphorus losses from dairy slurry;Brennan;Soil Use Man,2011
3. British standard methods of test for soils for civil engineering purposes;British Standards Institution,1990
4. Determination by mass-loss on ignition. British standard methods of test for soils for civil engineering purposes;British Standards Institution,1990