Cunningham, W. P. (2006). Principles of environmental science: Inquiry and applications. Dubuque: McGraw-Hill.
Chicago-tyylinen lähdeviittausCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Dubuque: McGraw-Hill, 2006.
MLA-viiteCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Dubuque: McGraw-Hill, 2006.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.