APA

United States, . (19). Water Resources and the Nation's water supply issues and concerns. [Washington, D.C: .

Chicago

United States, . 19. Water Resources and the Nation's water supply issues and concerns. [Washington, D.C: .

Harvard

United States, . (19). Water Resources and the Nation's water supply issues and concerns. [Washington, D.C: .

MLA

United States, . Water Resources and the Nation's water supply issues and concerns. [Washington, D.C: . 19.