Dyfyniad APA

National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region & ebrary, Inc. (2005). Regional cooperation for water quality improvement in southwestern Pennsylvania. National Academies Press.

Dyfyniad Arddull Chicago

National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region and Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. Washington, DC: National Academies Press, 2005.

Dyfyniad MLA

National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region and Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. National Academies Press, 2005.

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