1. Lynch, J.Laboratory Quality Assurance,Association of Official Analytical Chemists, 2005; http://www.eoma.aoac.org/app_e.pdf.
2. AOAC (Association of Offical Analytical Chemists) Official Methods of Analysis; http://www.eoma.aoac.org/.
3. AOCS (American Oil Chemists Society) Methods, http://search.aocs.org/methods/index.cfm.
4. AACC (American Association of Cereal Chemists) ApprovedMethods of Analysis, 11th ed.http://methods.aaccnet.org/.
5. ISO (International Organization for Standardization) Standardscatalogue, 67: Food technology, http://www.iso.org/iso/home/store/catalogue_ics_browse.htm?ICS1=67.