1. Draft International Standards, International Standards Organization, Geneva, 1993, ISO/DIS 10565, Norm ISO 5725.
2. Ibid. Draft International Standards, International Standards Organization, Geneva, 1993, ISO/DIS 10565, 1984, Norm ISO 5511.
3. Standards, Federation of Oils and Fats Association, London, 1988.
4. Draft International Standards, International Standards Organization, Geneva, 1988, ISO 659.
5. Ibid. Draft International Standards, International Standards Organization, Geneva, 1989, ISO 665.