1. Studies on the unsaponifiable matter of some vegetable oils;Aly,1981
2. Official methods of analysis;AOAC,1970
3. Official methods of analysis;AOAC,1980
4. A rapid method of total lipid extraction and purification;Bligh;Can. J. Biochem. Physiol.,1959
5. Chemical methods of analysis;Dee Snell,1972