1. Christiansen, A. Surfactant Science Series vol. 12 (ed. Bluestein, B. R. and Hilton, L. H.), Marcel Dekker, 1982, pp. 1–70.
2. Lomax, E. Recent Developments in the Analysis of Surfactants (ed. Porter, M. R.), Elsevier, 1991, pp. 109–136.
3. ISO 2271: 1989 (E): Surface active agents—Detergents—Determination of anion-active-matter by direct manual or mechanical two-phase titration procedure. International Organization for Standardization, Geneva.
4. Rosen, M. J. and Goldsmith, H. A. Systematic Analysis of Surface-Active Agents, 2nd edn, Interscience, 1972.
5. Longman, G. F. The Analysis of Detergents and Detergent Products, Wiley, 1975, p. 155.