1. Cattle manure: Reuse through wastelage feeding;Anthony,1969
2. Official Methods of Analysis;AOAC,1980
3. Compendium of Methods for Microbiological Examination of Foods;APHA,1976
4. Standard Methods for the Examination of Water and Wastewater;APHA,1985
5. The colorimetric determination of lactic acid in biological material;Barker;J. Biol. Chem.,1941