1. Association of Official Analytical Chemists.Official Methods of Analysis, 14th ed. The Association: Arlington, VA, pp. 842–846, 1984.
2. Ascorbic Acid: Chemistry, Metabolism, and Uses
3. Caulcutt, R., and Boddy, R.Statistics for Analytical Chemists.Chapman & Hall, London, pp. 83–85, 1983.