1. APHA, AWWA, EFA, 1998. Standard Methods for the Examination of Water and Wastewater, 20th ed. Washington, DC, USA
2. Bohm, R., 2002. Hygienic safety in organic waste management. In: Venglovsky, J., Greserova, G. (Eds.), Ramiran 2002. Proceedings of the 10th Interantional Conference on Hygene Safety, University Veterinary Medicine, Kosice, Slovak Republic, p. 17–30
3. Foot-and-mouth disease in cattle;Callis,1986
4. Chastain, J.P., Camberato, J.J., Albrecht, J.E., Adams, J., 1999. Swine manure production and nutrient content. In: South Carolina Confined Animal Manure Managers Certification Program. Clemson University, SC, USA (Chapter 3)
5. Statistical Procedures for Agricultural Research;Gomez,1984