APA

Pennington K. L. a. C. T. V., .Introduction to water resources and environmental issues. New York: Cambridge univerity prees, 2009: .

Chicago

Pennington Karrie Lynn and Cech Thomas V, .Introduction to water resources and environmental issues. New York: Cambridge univerity prees, 2009: .

Harvard

Pennington K. L. a. C. T. V., .Introduction to water resources and environmental issues. New York: Cambridge univerity prees, 2009: .

MLA

Pennington Karrie Lynn and Cech Thomas V, .New York: Cambridge univerity prees, 2009: . .