1. Bult A. Ion-pair and metal complex formation in drug analysis. In: Breimer DD, Speiser P, eds. Topics in Pharmaceutical Sciences 1983. Amsterdam: Elsevier Science Publishers BV, 1983:3–14.
2. Holzbecher Z, Divis L, Kral M, Sucha L, Vlacil F. Handbook of Organic Reagents in Inorganic Analysis. Chichester: Ellis Horwood Ltd., 1976.
3. Jansson SO, Modin R, Schill G. Two-phase titration of organic ammonium ions with lauryl sulphate and methyl yellow as indicator. Talanta 1974;21:905–18.
4. Budevsky O. Foundations of Chemical Analysis. Chichester: Ellis Horwood Ltd., 1979.
5. Schute JB. Berekening van titratiecurves, titreerfout en pH bij zuur-basetitraties. Chem Weekbl 1958;54:101–8.