For further reference, check out these sources:

Christopherson, R. W. 1995. Elemental Geosystems, Second Edition. Prentice Hall Inc., New Jersey.

Goldman, C.R. and A.J. Horne. 1983. Limnology. McGraw-Hill Book Company, New York.

Mackie, G.L., S. Hincks, D. Barker, R. McLaughlin, and P. Hebert. 1996. 15-345 Introduction to Aquatic Environments Course Manual and CD-ROM. University of Guelph, Guelph.

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Many of the uncredited photographs were obtained from a licensed Corel Stock Image Library.