1. Standard Methods for the Examination of Water and Wastewater;APHA,1975
2. Benthic sampling, analysis and ecological studies of nematodes;Baliga,1964
3. Occurrence of nematodes in benthic deposits;Baliga;Water Res.,1969
4. Canadian Drinking Water Standards and Objectives,1978
5. Proposed method for examination of water for free-living nematodes;Chang;J. Am. Wat. Wks Ass.,1960