1. Official Methods of Analysis;AOAC,1995
2. Kjeldahl's method for protein determination in cereals and feed;AOAC,1996
3. Official methods and recommended practices of the American Oil Chemists Society;AOCS (American Oil Chemists Society),1999
4. Changes of photosynthetic apparatus and gas exchange in dry beans and cowpea under drought conditions;Berova,2001
5. Bulgarian State Standard. Grain. Method for Determining the Content of Starch;BS 13488:1976,1976