1. Bard AJ, Faulkner LR. Electrochemical methods; New York, Chichester, Brisbane, Toronto, Singapore: John Wiley & Sons, 1980
2. Omnipore, Inc. Technical literature for the RETEC heavy metal recovery system; Sugar Land (TX): Omnipore, Inc., 1987.
3. United States Enviromental Protection Agency. Test methods for evaluating solid waste (SW-846); Vol. 1A. 3rd ed. United States Environmental Protection Agency, 1986. chapter 5, pp. 9010-1–9010-12.
4. Williams WJ. Handbook of anion determination. London, Boston, Sydney, Wellington, Durban, Toronto: Butterworths, 1979.
5. Pletcher D, Walsh FC. Industrial electrochemistry. 2nd ed. London, Glasgow, New York, Tokyo, Melbourne, Madras: Blackie Academic & Professional, 1993.