1. Anonymous, (1992). American Colloid Company. Literature on sodium bentonite. Feed Division, 5100 Suffield, Skokie, Illinois, USA.
2. Nutritional impacts of dietary oregano and Enviva essential oils on the performance, gut microbiota and blood biochemicals of growing ducks;Abouelezz K;Animal.,2019
3. A.O.A.C. (Association of Official Analytical Chemist) (1990). Association of Official Analytical Chemists. Official Methods of Analysis (13th eds). Washington D.C.
4. A.O.A.C. (2012). Official Methods of Analysis of AOAC International, 19th Edition. Association of Official Analytical Chemists International, Gaithersburg, Maryland, USA. Harrigan W F and McCance M E 1976 Laboratory Methods in Food and Dairy Microbiology. Academic Press Incorporated, London.
5. New Multiple Range Test;Duncan DE;Biometrics,1955