APA Citation

Anonymous.(1981). Chemical and biological quality of ground water. U. S. Geological Survey Professional Paper, p.235-236. http://pubs.usgs.gov/pp/1175/report.pdf

Chicago Style Citation

Anonymous. "Chemical and Biological Quality of Ground Water." U. S. Geological Survey Professional Paper 1981: p.235-236. http://pubs.usgs.gov/pp/1175/report.pdf

MLA Citation

Anonymous. "Chemical and Biological Quality of Ground Water." U. S. Geological Survey Professional Paper 1981: p.235-236. http://pubs.usgs.gov/pp/1175/report.pdf

Warning: These citations may not always be 100% accurate.