1. Official Methods of Analysis;AOAC,1990
2. Interrelationships of chemical properties, in vitro digestibility and rumen degradability characteristics of protein sources;Bediye,1996
3. Composition of Ethiopian Feedstuff, Research Report No. 6;Bediye,1989
4. Composition and Nutritive Value of Ethiopian feedstuff, Research Report No. 73;Bediye,2007
5. Dynamic Agricultural Book Three;Brown,2001