Cita APA

(2000). Water quality in the Allegheny and Monongahela River Basins: Pennsylvania, West Virginia, New York, and Maryland, 1996-98. Denver, Colo.: U.S. Departamento of the Interior, Geological Survey.

Citación estilo Chicago

Water Quality in the Allegheny and Monongahela River Basins: Pennsylvania, West Virginia, New York, and Maryland, 1996-98. Denver, Colo.: U.S. Departamento of the Interior, Geological Survey, 2000.

Cita MLA

Water Quality in the Allegheny and Monongahela River Basins: Pennsylvania, West Virginia, New York, and Maryland, 1996-98. Denver, Colo.: U.S. Departamento of the Interior, Geological Survey, 2000.