Anderson, R. M. (2001). Water quality in the Allegheny and Monogahela River Basins, Pennsylvania, West Virginia, New York, and Maryland, 1996 - 98. US Geological Survey circular 1202.
Chicago-stil citatAnderson, Robert M. "Water Quality in the Allegheny and Monogahela River Basins, Pennsylvania, West Virginia, New York, and Maryland, 1996 - 98." US Geological Survey Circular 1202 2001.
MLA-referensAnderson, Robert M. "Water Quality in the Allegheny and Monogahela River Basins, Pennsylvania, West Virginia, New York, and Maryland, 1996 - 98." US Geological Survey Circular 1202 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.