1. American Public Health Association et al. 1989. Standard methods for the Examination of Water, Sewage, and Wastewater. 17th Ed. American Public Health Association, Washington, D. C. 1550 pp.
2. Asbury, C.E., F.A. Vertucci, M.D. Mattson, and G.E. Likens. 1989. Acidification of Adirondack lakes. Environ. Sci. Technol. 23: 362–365.
3. Edmond, J.M. 1970. High precision determination of titration alkalinity and total carbon dioxide content of sea water by potentiometric titration. Deep-Sea Res. 17: 737–750.
4. Golterman, H.L. and R.S. Clymo, (eds). 1969. Methods for Chemical Analysis of Fresh Waters.IBP Handbook No. 8. Blackwell, Oxford. 172 pp.
5. Gran, G. 1952. Determination of the equivalence point in potentiometric titrations. Part II. Analyst 77: 661–671.