LITERATURE CITED
- APHA Standard methods for the examination of water and wastewater . 1975 . Sect, , 14th Ed. Washington, D.C : American Public Health Assoc. . 1002F
- Elliott , J. M. 1977 . “ Some methods for the statistical analysis of samples of benthic invertebrates ” . In Sci. Publ. 25, Freshwater Biological Association, Ferry House, U.K.
- Green , R. H. 1979 . Sampling design and statistical methods for environmental biologists N.Y : John Wiley & Sons .
- Lackey , J. B. 1938 . The manipulation and counting of river plankton and changes in some organisms due to formalin preservation . Pub. Health Rept. , 53 : 2080
- Southwood , T. R.E. 1978 . Ecological Methods, 2nd Ed N.Y : John Wiley & Sons .