1. APHA. 1976. American Public Health Association, Standard methods for the examination of water and waste water. 14th edition. APHA, New York
2. Cairns J. Jr., M. L. Dahlberg, K. L. Dickson, N. Smith, W. T. Waller. 1969. The relationship of freshwater protozoan communities to the MacArthur-Wilson equilibrium model. American Naturalist 103:439–454
3. Cairns J. Jr., W. H. Jr. Yongue, H. Jr. Boatin. 1973. The Protozoan colonization of polyurethane foam units anchored in the benthic area of Douglas Lake, Michigan. Transaction of American Microbiological Society 92: 643–656
4. China State Bureau of Technical Supervision, China EPA. 1992. National standard of PRC, water quality–microbial community biomonitoring–PFU method (GB/T12990-91). Chinese Standard Press, Beijing, 154
5. China State Bureau of Environmental Protection Bureau. 2002. Environmental quality standards for surface water (GB 383-2002). Chinese Standard Press, Beijing