1. Official and Tentative Methods of the American Oil Chemists’ Society, Method Cd 3d–63, American Oil Chemists’ Society, Champaign, 1989.
2. Official and Tentative Methods of the Japan Oil Chemists' Society, Method 2.4.1–83, Japan Oil Chemists' Society, Tokyo, 1990.
3. US Pharmacopoeia XXIII, United States Pharmacopeial Convention, New York, 1995, p. 738.
4. Japan Pharmacopoeia 13th, The Pharmaceutical Society of Japan, Tokyo, 1996, p. B522.
5. Effects of proton donors on the polarographic reduction of methyl-p-benzoquinone in aqueous and methyl cellosolve solutions