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.
Chicago-viite (17. p.)National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region ja Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. Washington, DC: National Academies Press, 2005.
MLA-viite (9. p.)National Research Council (U.S.). Committee on Water Quality Improvement for the Pittsburgh Region ja Inc ebrary. Regional Cooperation for Water Quality Improvement in Southwestern Pennsylvania. National Academies Press, 2005.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.