1. Standard Methods for the Examination of Water and Wastewater, 15th Ed. (American Public Health Association, Inc. New York, 1980).
2. Ph.D. thesis, University of Notre Dame. South Bend, IN (1978).
3. Manual of Methods for General Bacteriology (American Society for Microbiology, Washington, DC, 1981).
4. and Microscopic Sludge Investigation Manual (TNO Research Institute for Environmental Hygiene, Delft, The Netherlands, 1981).