Appelo, C.A.J. and Postma, D. (1993) Geochemistry, Groundwater and Pollution. Balkema, Rotterdam,
      536p.

Cherry, J.A. (1984) Groundwater contamination. MAC Short Course Handbook 10 (Ed. Fleet M.E.),
      269-306.

Datta, P.S., Tyagi, S.K., Mookerjee, P.M., Bhattacharaya, S.K., Gupta, N., and Bhatnagar, P.D. 
      (1999) Groundwater NO3 and F contamination processes in Pushkar valley, Rahasthan as
      reflected from 18O isotopic signature and 3H recharge studies. Environ. 
      Monitor. Assess., 56, 209-219.

Davis, J.C. (1983) Statistics and Data Analysis in Geology, 2nd Ed. John Wiley, New York,646p. 

Fatta, D., Papadopoulos, A.E., and Loizidou, M. (1999) A study on landfill leachate and its 
      impact on the groundwater quality of the Breater Area. Environ. Geochem. Healty, 21, 
      175-190.

Gibbs, R.J. (1970) Mechanisms controlling world water chemistry. Science, 170, 1088-1090.

Goerlitz, D.F. and Brown, E. (1972) Methods for Analysis of Organic Substances in Water. USGS 
      TWRI, Book 5 Chapter A3, 40 pp.

Greenberg et al. (1992) Standard Methods for the Examination of Water and Wastewater, 18th Ed. 
      APHA, AWWA, WEF.Handa, B.K. (1965) Modified Hill-Piper diagram for classification of 
      groundwater in arid and semi-arid regions. Geochemical Society of India Bulletin 1, 20-24.

Hull, R.W., Kharaka, Y.K., Maest, A.S., and Fries, T.L. (1984) Sampling and analysis of 
      subsurface water. In Practical Applications of Groundwater Geochemistry (Ed. B. Hitchon and 
      E.I. Wallick). Proceedings of First Canadian/American Conference on Hydrogeology, 117-126.

Lee, T.-C. (1998) LEEGRAM: A program for normalized stiff diagrams and quantification of 
      grouping hydrochemical data. Computers and Geosicences, 24, 523-529.

Piper, A.M. (1944) A graphic procedure in the geochemical interpretation of water analyses. 
      Trans. Amer. Geophys. Union, 25, 914-923.

Rao, N.S. (1998) MHPT.BAS: A computer program for modified Hill-Piper diagram for classification 
      of groundwater. Computers and Geosciences, 24, 991-1008.

Stiff, H.A., Jr. (1951) The interpretation of chemical water analysis by means of patterns. 
      J. Petroleum Tech., 3, 15-17.

Wood, W.W. (1976) Techniques of Water Resources Investigations of the United States Geological 
      Survey - Guidelines for Collection and Field Analysis of Groundwater Samples for Selected 
      Unstable Constituents. 1-24, USGS.

Yu, J.-Y. (1996) Pollution of Osheepcheon Creek by abandoned coal mine drainage in Dogyae area, 
      eastern part of the Samcheok Coal Field, Kangwon-Do, Korea.  Environ. Geol., 27, 286-299.