1. Cotton, F. A. & Wilkinson, G. (1980). Advanced inorganic chemistry (p. 747). New York, NY: Wiley.
2. Feigl, F. (2012). Anger V Spot Tests in organic analysis (7th ed., p. 451). Netherlands: Elsevier.
3. Kinetic and Mechanistic Investigations of Oxidation of Pentoxifylline Drug by Alkaline Permanganate
4. Permanganate oxidations in strongly basic solutions
5. Jeffery, G. H., Bassett, J., Mendham, J. & Denney, R. C. (1989). Vogel’s text book of quantitative chemical analysis (5th ed., p. 70). New York, NY: Longman Scientific & Technical Co-published in the United States with Wiley.