1. Official Methods of Analysis;AOAC,1980
2. Compendium of Methods for Microbiological Examination of Foods;APHA,1976
3. Processing and handling of animal excreta per refeeding;Arndt;J. Anim. Sci.,1979
4. ASAE STANDARDS (1988). American Society of Agricultural Engineering, St Joseph, MI, p. 427.
5. Farm animal manures;Azevedo,1974