1. Epton, S.R., A Rapid Method of Analysis for Certain Surface-Active Agents, Nature 160:795 (1947).
2. Epton, S.R., A New Method for the Rapid Titrimetric Analysis of Sodium Alkyl Sulphates and Related Compounds, Trans. Faraday Soc. 44:226 (1948).
3. Japanese Industrial Standard (JIS) K3362, Testing Method for Synthetic Detergent, Japanese Standard Committee, Tokyo, 1990.
4. International Standard (ISO) 2870, Surface Active Agents—Detergents—Determination of Anionic Active Matter Hydrolyzable and Non-hydrolyzable Under Acid Conditions, International Organization for Standardization, Switzerland, 1986.
5. International Standard (ISO) 2271, Surface Active Agents—Detergents—Determination of Anionic-Active Matter by Manual or Mechanical Direct Two-Phase Titration Procedure, International Organization for Standardization, Switzerland, 1989.